diff --git a/CHANGELOG.md b/CHANGELOG.md
index 6a64f47b0..45bcfea47 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,15 +1,19 @@
 ## [Unreleased]
 
 ### Added
+
+- Add downsample section to ILMs [#538](https://github.com/elastic/terraform-provider-elasticstack/pull/538)
 - Add new optional `ca_certs` attribute for Kibana ([#507](https://github.com/elastic/terraform-provider-elasticstack/pull/507))
 
 ### Fixed
+
 - Handle nil LastExecutionDate's in Kibana alerting rules. ([#508](https://github.com/elastic/terraform-provider-elasticstack/pull/508))
 - Import all relevant attributes during `elasticstack_fleet_output` import ([#522](https://github.com/elastic/terraform-provider-elasticstack/pull/522))
 
 ## [0.11.0] - 2023-12-12
 
 ### Added
+
 - Switch to Terraform [protocol version 6](https://developer.hashicorp.com/terraform/plugin/terraform-plugin-protocol#protocol-version-6) that is compatible with Terraform CLI version 1.0 and later.
 - Add 'elasticstack_fleet_package' data source ([#469](https://github.com/elastic/terraform-provider-elasticstack/pull/469))
 - Add `tags` option to Kibana's SLOs ([#495](https://github.com/elastic/terraform-provider-elasticstack/pull/495))
@@ -19,6 +23,7 @@
 - Support for Kibana API Key authentication ([#372](https://github.com/elastic/terraform-provider-elasticstack/pull/372))
 
 ### Fixed
+
 - Rename fleet package objects to `elasticstack_fleet_integration` and `elasticstack_fleet_integration_policy` ([#476](https://github.com/elastic/terraform-provider-elasticstack/pull/476))
 - Fix a provider crash when managing SLOs outside of the default Kibana space. ([#485](https://github.com/elastic/terraform-provider-elasticstack/pull/485))
 - Make input optional for `elasticstack_fleet_integration_policy` ([#493](https://github.com/elastic/terraform-provider-elasticstack/pull/493))
@@ -28,6 +33,7 @@
 ## [0.10.0] - 2023-11-02
 
 ### Added
+
 - Add support for Kibana security role ([#435](https://github.com/elastic/terraform-provider-elasticstack/pull/435))
 - Introduce `elasticstack_kibana_import_saved_objects` resource as an additive only way to manage Kibana saved objects ([#343](https://github.com/elastic/terraform-provider-elasticstack/pull/343)).
 - Add support for Terraform Plugin Framework ([#343](https://github.com/elastic/terraform-provider-elasticstack/pull/343)).
@@ -39,45 +45,53 @@
 ## [0.9.0] - 2023-10-09
 
 ### Added
+
 - Update `elasticstack_fleet_output` to use new API schema format ([#434](https://github.com/elastic/terraform-provider-elasticstack/pull/434))
 
 ### Fixed
+
 - Fix mapping of webhook connectors that is stored in tfstate ([#433](https://github.com/elastic/terraform-provider-elasticstack/pull/433))
 
 ## [0.8.0] - 2023-09-26
 
 ### Added
+
 - Add support for the `.slack_api` connector type for Kibana action connectors ([#419](https://github.com/elastic/terraform-provider-elasticstack/pull/419))
 - resource `elasticstack_kibana_slo`: Update `histogram_custom_indicator` `from` and `to` fields to float ([#430](https://github.com/elastic/terraform-provider-elasticstack/pull/430))
 
 ## [0.7.0] - 2023-08-22
 
 ### Added
+
 - Add support for Kibana SLOs ([#385](https://github.com/elastic/terraform-provider-elasticstack/pull/385))
 - Document all available environment variables ([#405](https://github.com/elastic/terraform-provider-elasticstack/pull/405))
 
 ## [0.6.2] - 2023-06-19
 
 ### Added
+
 - Logging of Kibana action connectors HTTP requests and responses when [Terraform logs are enabled](https://developer.hashicorp.com/terraform/internals/debugging).
 - Add `skip_destroy` flag to `elasticstack_fleet_agent_policy` resource ([#357](https://github.com/elastic/terraform-provider-elasticstack/pull/357))
 
 ## [0.6.1] - 2023-05-30
 
 ### Added
+
 - Add `path_style_access` setting to `elasticstack_elasticsearch_snapshot_repository` on s3 repositories to enable path style access pattern ([#331](https://github.com/elastic/terraform-provider-elasticstack/pull/331))
 - Add `transform` field to `elasticstack_elasticsearch_watch` to allow for payload transforms to be defined ([#340](https://github.com/elastic/terraform-provider-elasticstack/pull/340))
 
 ### Fixed
+
 - Fix error presented by incorrect handling of `disabled_features` field in `elasticstack_kibana_space` resource ([#340](https://github.com/elastic/terraform-provider-elasticstack/pull/340))
 
 ## [0.6.0] - 2023-05-24
 
 ### Added
+
 - New resource `elasticstack_elasticsearch_enrich_policy` to manage enrich policies ([#286](https://github.com/elastic/terraform-provider-elasticstack/pull/286)) ([Enrich API](https://www.elastic.co/guide/en/elasticsearch/reference/current/enrich-apis.html))
 - New data source `elasticstack_elasticsearch_enrich_policy` to read enrich policies ([#293](https://github.com/elastic/terraform-provider-elasticstack/pull/293)) ([Enrich API](https://www.elastic.co/guide/en/elasticsearch/reference/current/enrich-apis.html))
 - Add 'mapping_coerce' field to index resource ([#229](https://github.com/elastic/terraform-provider-elasticstack/pull/229))
-- Add 'min_*' conditions to ILM rollover ([#250](https://github.com/elastic/terraform-provider-elasticstack/pull/250))
+- Add 'min\_\*' conditions to ILM rollover ([#250](https://github.com/elastic/terraform-provider-elasticstack/pull/250))
 - Add support for Kibana connections ([#226](https://github.com/elastic/terraform-provider-elasticstack/pull/226))
 - **[Breaking Change] Add 'deletion_protection' field to index resource** to avoid unintentional deletion. ([#167](https://github.com/elastic/terraform-provider-elasticstack/pull/167))
   - To delete index resource, you'll need to explicitly set `deletion_protection = false` as follows.
@@ -102,11 +116,12 @@
 - Add `elasticstack_kibana_action_connector` for managing Kibana action connectors ([#306](https://github.com/elastic/terraform-provider-elasticstack/pull/306))
 
 ### Fixed
+
 - Updated unsupported queue_max_bytes_number and queue_max_bytes_units with queue.max_bytes ([#266](https://github.com/elastic/terraform-provider-elasticstack/issues/266))
 - Respect `ignore_unavailable` and `include_global_state` values when configuring SLM policies ([#224](https://github.com/elastic/terraform-provider-elasticstack/pull/224))
 - Refactor API client functions and return diagnostics ([#220](https://github.com/elastic/terraform-provider-elasticstack/pull/220))
 - Fix not to recreate index when field is removed from mapping ([#232](https://github.com/elastic/terraform-provider-elasticstack/pull/232))
-- Add query params fields to index resource  ([#244](https://github.com/elastic/terraform-provider-elasticstack/pull/244))
+- Add query params fields to index resource ([#244](https://github.com/elastic/terraform-provider-elasticstack/pull/244))
 - Properly handle errors which occur during provider execution ([#262](https://github.com/elastic/terraform-provider-elasticstack/pull/262))
 - Correctly handle empty logstash pipeline metadata in plan diffs ([#256](https://github.com/elastic/terraform-provider-elasticstack/pull/256))
 - Fix error when logging API requests in debug mode ([#259](https://github.com/elastic/terraform-provider-elasticstack/pull/259))
@@ -139,6 +154,7 @@
 ## [0.5.0] - 2022-12-07
 
 ### Added
+
 - New resource `elasticstack_elasticsearch_logstash_pipeline` to manage Logstash pipelines ([Centralized Pipeline Management](https://www.elastic.co/guide/en/logstash/current/logstash-centralized-pipeline-management.html)) ([#151](https://github.com/elastic/terraform-provider-elasticstack/pull/151))
 - Add `elasticstack_elasticsearch_script` resource ([#173](https://github.com/elastic/terraform-provider-elasticstack/pull/173))
 - Add `elasticstack_elasticsearch_security_role` data source ([#177](https://github.com/elastic/terraform-provider-elasticstack/pull/177))
@@ -151,12 +167,14 @@
 - Deprecate `elasticsearch_connection` blocks on individual resources/data sources. Connection configuration should be configured directly on the provider with multiple provider instances used to connect to different clusters. ([#218](https://github.com/elastic/terraform-provider-elasticstack/pull/218))
 
 ### Fixed
+
 - Remove unnecessary unsetting id on delete ([#174](https://github.com/elastic/terraform-provider-elasticstack/pull/174))
 - Fix not found handling for snapshot repository ([#175](https://github.com/elastic/terraform-provider-elasticstack/pull/175))
 - Add warn log when to remove resource from state ([#185](https://github.com/elastic/terraform-provider-elasticstack/pull/185))
 - Import snapshot repository name when importing ([#187](https://github.com/elastic/terraform-provider-elasticstack/pull/187))
 
 ## [0.4.0] - 2022-10-07
+
 ### Added
 
 - Add ca_data field to provider schema ([#145](https://github.com/elastic/terraform-provider-elasticstack/pull/145))
@@ -168,6 +186,7 @@
 - Add elasticstack_elasticsearch_security_role_mapping resource ([148](https://github.com/elastic/terraform-provider-elasticstack/pull/148))
 
 ### Fixed
+
 - Refactor main function not to use deprecated debug method ([#149](https://github.com/elastic/terraform-provider-elasticstack/pull/149))
 - Expose provider package ([#142](https://github.com/elastic/terraform-provider-elasticstack/pull/142))
 - Upgrade Go version to 1.19 and sdk version to v2.22.0 ([#139](https://github.com/elastic/terraform-provider-elasticstack/pull/139))
@@ -176,50 +195,65 @@
 - Support **7.x** Elasticsearch < **7.15** by removing the default `media_type` attribute in the Append processor ([#118](https://github.com/elastic/terraform-provider-elasticstack/pull/118))
 
 ## [0.3.3] - 2022-03-22
+
 ### Fixed
+
 - Make sure it is possible to set priority to `0` in ILM template ([#88](https://github.com/elastic/terraform-provider-elasticstack/issues/88))
 - Set the ILM name on read operation ([#87](https://github.com/elastic/terraform-provider-elasticstack/issues/87))
 - Always use data_stream setting if it's present ([#91](https://github.com/elastic/terraform-provider-elasticstack/issues/91))
 
 ## [0.3.2] - 2022-02-28
+
 ### Fixed
+
 - Properly apply `number_of_replicas` setting in `allocate` action in ILM ([#80](https://github.com/elastic/terraform-provider-elasticstack/issues/80))
 
 ## [0.3.1] - 2022-02-24
+
 ### Fixed
+
 - Add new field `allow_custom_routing` in `data_stream` section of [`index_template`](https://www.elastic.co/guide/en/elasticsearch/reference/8.0/indices-put-template.html#put-index-template-api-request-body), which appears only in Elasticsearch version **8.0.0**. Make sure `index_template` resource can work with both **7.x** and **8.x** versions ([#72](https://github.com/elastic/terraform-provider-elasticstack/pull/72))
 - Panic using `elasticstack_elasticsearch_security_user_data_source` when the user absent or there is not enough permissions to fetch users from ES API ([#73](https://github.com/elastic/terraform-provider-elasticstack/issues/73))
 - Fix typo in the index alias model ([#78](https://github.com/elastic/terraform-provider-elasticstack/issues/78))
 
 ## [0.3.0] - 2022-02-17
+
 ### Added
+
 - New resource `elasticstack_elasticsearch_data_stream` to manage Elasticsearch [data streams](https://www.elastic.co/guide/en/elasticsearch/reference/current/data-streams.html) ([#45](https://github.com/elastic/terraform-provider-elasticstack/pull/45))
 - New resource `elasticstack_elasticsearch_ingest_pipeline` to manage Elasticsearch [ingest pipelines](https://www.elastic.co/guide/en/elasticsearch/reference/7.16/ingest.html) ([#56](https://github.com/elastic/terraform-provider-elasticstack/issues/56))
 - New resource `elasticstack_elasticsearch_component_template` to manage Elasticsearch [component templates](https://www.elastic.co/guide/en/elasticsearch/reference/current/indices-component-template.html) ([#39](https://github.com/elastic/terraform-provider-elasticstack/pull/39))
 - New helper data sources to create [processorts](https://www.elastic.co/guide/en/elasticsearch/reference/current/processors.html) for ingest pipelines ([#67](https://github.com/elastic/terraform-provider-elasticstack/pull/67))
 
 ### Fixed
+
 - Update only changed index settings ([#52](https://github.com/elastic/terraform-provider-elasticstack/issues/52))
 - Enable import of index settings ([#53](https://github.com/elastic/terraform-provider-elasticstack/issues/53))
 - Handle `allocate` action in ILM policy ([#59](https://github.com/elastic/terraform-provider-elasticstack/issues/59))
 - Send only initialized values to Elasticsearch API when managing the users ([#66](https://github.com/elastic/terraform-provider-elasticstack/issues/66))
 
 ## [0.2.0] - 2022-01-27
+
 ### Added
+
 - New resource to manage Elasticsearch indices ([#38](https://github.com/elastic/terraform-provider-elasticstack/pull/38))
 - The `insecure` option to the Elasticsearch provider configuration to ignore certificate verification ([#36](https://github.com/elastic/terraform-provider-elasticstack/pull/36))
 - The `ca_file` option to the Elasticsearch provider configuration to provide path to the custom root certificate file ([#35](https://github.com/elastic/terraform-provider-elasticstack/pull/35))
 - Documentation templates for all the existing resources ([#32](https://github.com/elastic/terraform-provider-elasticstack/pull/32))
 
 ### Fixed
+
 - Identify missing or deleted resources in the Elasticsearch cluster and make sure Terraform can re-create them ([#40](https://github.com/elastic/terraform-provider-elasticstack/pull/40))
 
 ### Changed
+
 - **[Breaking]** Rename `aliases` configuration option in
-`elasticstack_elasticsearch_index_template` resource to singular `alias`
+  `elasticstack_elasticsearch_index_template` resource to singular `alias`
 
 ## [0.1.0] - 2021-12-20
+
 ### Added
+
 - Initial set of the resources to gather feedback from the community
 - Initial set of docs
 - CI integration
diff --git a/docs/resources/elasticsearch_index_lifecycle.md b/docs/resources/elasticsearch_index_lifecycle.md
index 3b8e2ccc6..a3926b1a1 100644
--- a/docs/resources/elasticsearch_index_lifecycle.md
+++ b/docs/resources/elasticsearch_index_lifecycle.md
@@ -81,6 +81,7 @@ resource "elasticstack_elasticsearch_index_lifecycle" "my_ilm" {
 Optional:
 
 - `allocate` (Block List, Max: 1) Updates the index settings to change which nodes are allowed to host the index shards and change the number of replicas. (see [below for nested schema](#nestedblock--cold--allocate))
+- `downsample` (Block List, Max: 1) Roll up documents within a fixed interval to a single summary document. Reduces the index footprint by storing time series data at reduced granularity. (see [below for nested schema](#nestedblock--cold--downsample))
 - `freeze` (Block List, Max: 1) Freeze the index to minimize its memory footprint. (see [below for nested schema](#nestedblock--cold--freeze))
 - `migrate` (Block List, Max: 1) Moves the index to the data tier that corresponds to the current phase by updating the "index.routing.allocation.include._tier_preference" index setting. (see [below for nested schema](#nestedblock--cold--migrate))
 - `min_age` (String) ILM moves indices through the lifecycle according to their age. To control the timing of these transitions, you set a minimum age for each phase.
@@ -101,6 +102,18 @@ Optional:
 - `total_shards_per_node` (Number) The maximum number of shards for the index on a single Elasticsearch node. Defaults to `-1` (unlimited). Supported from Elasticsearch version **7.16**
 
 
+<a id="nestedblock--cold--downsample"></a>
+### Nested Schema for `cold.downsample`
+
+Required:
+
+- `fixed_interval` (String) Downsampling interval
+
+Optional:
+
+- `wait_timeout` (String) Downsampling interval
+
+
 <a id="nestedblock--cold--freeze"></a>
 ### Nested Schema for `cold.freeze`
 
@@ -226,6 +239,7 @@ Optional:
 
 Optional:
 
+- `downsample` (Block List, Max: 1) Roll up documents within a fixed interval to a single summary document. Reduces the index footprint by storing time series data at reduced granularity. (see [below for nested schema](#nestedblock--hot--downsample))
 - `forcemerge` (Block List, Max: 1) Force merges the index into the specified maximum number of segments. This action makes the index read-only. (see [below for nested schema](#nestedblock--hot--forcemerge))
 - `min_age` (String) ILM moves indices through the lifecycle according to their age. To control the timing of these transitions, you set a minimum age for each phase.
 - `readonly` (Block List, Max: 1) Makes the index read-only. (see [below for nested schema](#nestedblock--hot--readonly))
@@ -235,6 +249,18 @@ Optional:
 - `shrink` (Block List, Max: 1) Sets a source index to read-only and shrinks it into a new index with fewer primary shards. (see [below for nested schema](#nestedblock--hot--shrink))
 - `unfollow` (Block List, Max: 1) Convert a follower index to a regular index. Performed automatically before a rollover, shrink, or searchable snapshot action. (see [below for nested schema](#nestedblock--hot--unfollow))
 
+<a id="nestedblock--hot--downsample"></a>
+### Nested Schema for `hot.downsample`
+
+Required:
+
+- `fixed_interval` (String) Downsampling interval
+
+Optional:
+
+- `wait_timeout` (String) Downsampling interval
+
+
 <a id="nestedblock--hot--forcemerge"></a>
 ### Nested Schema for `hot.forcemerge`
 
@@ -315,6 +341,7 @@ Optional:
 Optional:
 
 - `allocate` (Block List, Max: 1) Updates the index settings to change which nodes are allowed to host the index shards and change the number of replicas. (see [below for nested schema](#nestedblock--warm--allocate))
+- `downsample` (Block List, Max: 1) Roll up documents within a fixed interval to a single summary document. Reduces the index footprint by storing time series data at reduced granularity. (see [below for nested schema](#nestedblock--warm--downsample))
 - `forcemerge` (Block List, Max: 1) Force merges the index into the specified maximum number of segments. This action makes the index read-only. (see [below for nested schema](#nestedblock--warm--forcemerge))
 - `migrate` (Block List, Max: 1) Moves the index to the data tier that corresponds to the current phase by updating the "index.routing.allocation.include._tier_preference" index setting. (see [below for nested schema](#nestedblock--warm--migrate))
 - `min_age` (String) ILM moves indices through the lifecycle according to their age. To control the timing of these transitions, you set a minimum age for each phase.
@@ -335,6 +362,18 @@ Optional:
 - `total_shards_per_node` (Number) The maximum number of shards for the index on a single Elasticsearch node. Defaults to `-1` (unlimited). Supported from Elasticsearch version **7.16**
 
 
+<a id="nestedblock--warm--downsample"></a>
+### Nested Schema for `warm.downsample`
+
+Required:
+
+- `fixed_interval` (String) Downsampling interval
+
+Optional:
+
+- `wait_timeout` (String) Downsampling interval
+
+
 <a id="nestedblock--warm--forcemerge"></a>
 ### Nested Schema for `warm.forcemerge`
 
diff --git a/internal/elasticsearch/index/ilm.go b/internal/elasticsearch/index/ilm.go
index 5a8fc9650..dae40e015 100644
--- a/internal/elasticsearch/index/ilm.go
+++ b/internal/elasticsearch/index/ilm.go
@@ -46,7 +46,7 @@ func ResourceIlm() *schema.Resource {
 			MaxItems:     1,
 			AtLeastOneOf: []string{"hot", "warm", "cold", "frozen", "delete"},
 			Elem: &schema.Resource{
-				Schema: getSchema("set_priority", "unfollow", "rollover", "readonly", "shrink", "forcemerge", "searchable_snapshot"),
+				Schema: getSchema("set_priority", "unfollow", "rollover", "readonly", "shrink", "forcemerge", "searchable_snapshot", "downsample"),
 			},
 		},
 		"warm": {
@@ -56,7 +56,7 @@ func ResourceIlm() *schema.Resource {
 			MaxItems:     1,
 			AtLeastOneOf: []string{"hot", "warm", "cold", "frozen", "delete"},
 			Elem: &schema.Resource{
-				Schema: getSchema("set_priority", "unfollow", "readonly", "allocate", "migrate", "shrink", "forcemerge"),
+				Schema: getSchema("set_priority", "unfollow", "readonly", "allocate", "migrate", "shrink", "forcemerge", "downsample"),
 			},
 		},
 		"cold": {
@@ -66,7 +66,7 @@ func ResourceIlm() *schema.Resource {
 			MaxItems:     1,
 			AtLeastOneOf: []string{"hot", "warm", "cold", "frozen", "delete"},
 			Elem: &schema.Resource{
-				Schema: getSchema("set_priority", "unfollow", "readonly", "searchable_snapshot", "allocate", "migrate", "freeze"),
+				Schema: getSchema("set_priority", "unfollow", "readonly", "searchable_snapshot", "allocate", "migrate", "freeze", "downsample"),
 			},
 		},
 		"frozen": {
@@ -389,6 +389,27 @@ var supportedActions = map[string]*schema.Schema{
 			},
 		},
 	},
+	"downsample": {
+		Description: "Roll up documents within a fixed interval to a single summary document. Reduces the index footprint by storing time series data at reduced granularity.",
+		Type:        schema.TypeList,
+		Optional:    true,
+		MaxItems:    1,
+		Elem: &schema.Resource{
+			Schema: map[string]*schema.Schema{
+				"fixed_interval": {
+					Description: "Downsampling interval",
+					Type:        schema.TypeString,
+					Required:    true,
+				},
+				"wait_timeout": {
+					Description: "Downsampling interval",
+					Type:        schema.TypeString,
+					Optional:    true,
+					Computed:    true,
+				},
+			},
+		},
+	},
 }
 
 func getSchema(actions ...string) map[string]*schema.Schema {
@@ -519,6 +540,8 @@ func expandPhase(p map[string]interface{}, serverVersion *version.Version) (*mod
 				}
 			case "wait_for_snapshot":
 				actions[actionName], diags = expandAction(a, serverVersion, "policy")
+			case "downsample":
+				actions[actionName], diags = expandAction(a, serverVersion, "fixed_interval", "wait_timeout")
 			default:
 				diags = append(diags, diag.Diagnostic{
 					Severity: diag.Error,
diff --git a/internal/elasticsearch/index/ilm_test.go b/internal/elasticsearch/index/ilm_test.go
index d30e0a5c0..177da2195 100644
--- a/internal/elasticsearch/index/ilm_test.go
+++ b/internal/elasticsearch/index/ilm_test.go
@@ -15,6 +15,8 @@ import (
 )
 
 var totalShardsPerNodeVersionLimit = version.Must(version.NewVersion("7.16.0"))
+var downsampleNoTimeoutVersionLimit = version.Must(version.NewVersion("8.5.0"))
+var downsampleVersionLimit = version.Must(version.NewVersion("8.10.0"))
 
 func TestAccResourceILM(t *testing.T) {
 	// generate a random policy name
@@ -75,6 +77,43 @@ func TestAccResourceILM(t *testing.T) {
 					resource.TestCheckResourceAttr("elasticstack_elasticsearch_index_lifecycle.test", "warm.0.allocate.0.total_shards_per_node", "200"),
 				),
 			},
+			{
+				SkipFunc: versionutils.CheckIfVersionIsUnsupported(downsampleNoTimeoutVersionLimit),
+				Config:   testAccResourceILMDownsampleNoTimeout(policyName),
+				Check: resource.ComposeTestCheckFunc(
+					resource.TestCheckResourceAttr("elasticstack_elasticsearch_index_lifecycle.test", "name", policyName),
+					resource.TestCheckResourceAttr("elasticstack_elasticsearch_index_lifecycle.test", "hot.0.min_age", "1h"),
+					resource.TestCheckResourceAttr("elasticstack_elasticsearch_index_lifecycle.test", "hot.0.set_priority.0.priority", "10"),
+					resource.TestCheckResourceAttr("elasticstack_elasticsearch_index_lifecycle.test", "hot.0.downsample.0.fixed_interval", "1d"),
+					resource.TestCheckResourceAttr("elasticstack_elasticsearch_index_lifecycle.test", "hot.0.rollover.0.max_age", "1d"),
+					resource.TestCheckResourceAttr("elasticstack_elasticsearch_index_lifecycle.test", "hot.0.readonly.0.enabled", "true"),
+					resource.TestCheckResourceAttr("elasticstack_elasticsearch_index_lifecycle.test", "delete.0.min_age", "0ms"),
+					resource.TestCheckResourceAttr("elasticstack_elasticsearch_index_lifecycle.test", "hot.#", "1"),
+					resource.TestCheckResourceAttr("elasticstack_elasticsearch_index_lifecycle.test", "delete.#", "1"),
+					resource.TestCheckResourceAttr("elasticstack_elasticsearch_index_lifecycle.test", "warm.#", "0"),
+					resource.TestCheckResourceAttr("elasticstack_elasticsearch_index_lifecycle.test", "cold.#", "0"),
+					resource.TestCheckResourceAttr("elasticstack_elasticsearch_index_lifecycle.test", "frozen.#", "0"),
+				),
+			},
+			{
+				SkipFunc: versionutils.CheckIfVersionIsUnsupported(downsampleVersionLimit),
+				Config:   testAccResourceILMDownsample(policyName),
+				Check: resource.ComposeTestCheckFunc(
+					resource.TestCheckResourceAttr("elasticstack_elasticsearch_index_lifecycle.test", "name", policyName),
+					resource.TestCheckResourceAttr("elasticstack_elasticsearch_index_lifecycle.test", "hot.0.min_age", "1h"),
+					resource.TestCheckResourceAttr("elasticstack_elasticsearch_index_lifecycle.test", "hot.0.set_priority.0.priority", "10"),
+					resource.TestCheckResourceAttr("elasticstack_elasticsearch_index_lifecycle.test", "hot.0.downsample.0.fixed_interval", "1d"),
+					resource.TestCheckResourceAttr("elasticstack_elasticsearch_index_lifecycle.test", "hot.0.downsample.0.wait_timeout", "1d"),
+					resource.TestCheckResourceAttr("elasticstack_elasticsearch_index_lifecycle.test", "hot.0.rollover.0.max_age", "1d"),
+					resource.TestCheckResourceAttr("elasticstack_elasticsearch_index_lifecycle.test", "hot.0.readonly.0.enabled", "true"),
+					resource.TestCheckResourceAttr("elasticstack_elasticsearch_index_lifecycle.test", "delete.0.min_age", "0ms"),
+					resource.TestCheckResourceAttr("elasticstack_elasticsearch_index_lifecycle.test", "hot.#", "1"),
+					resource.TestCheckResourceAttr("elasticstack_elasticsearch_index_lifecycle.test", "delete.#", "1"),
+					resource.TestCheckResourceAttr("elasticstack_elasticsearch_index_lifecycle.test", "warm.#", "0"),
+					resource.TestCheckResourceAttr("elasticstack_elasticsearch_index_lifecycle.test", "cold.#", "0"),
+					resource.TestCheckResourceAttr("elasticstack_elasticsearch_index_lifecycle.test", "frozen.#", "0"),
+				),
+			},
 		},
 	})
 }
@@ -249,6 +288,75 @@ resource "elasticstack_elasticsearch_index_lifecycle" "test_rollover" {
  `, name)
 }
 
+func testAccResourceILMDownsampleNoTimeout(name string) string {
+	return fmt.Sprintf(`
+provider "elasticstack" {
+  elasticsearch {}
+}
+
+resource "elasticstack_elasticsearch_index_lifecycle" "test" {
+  name = "%s"
+
+  hot {
+    min_age = "1h"
+
+    set_priority {
+      priority = 10
+    }
+
+    rollover {
+      max_age = "1d"
+    }
+
+    downsample {
+      fixed_interval = "1d"
+    }
+
+    readonly {}
+  }
+
+  delete {
+    delete {}
+  }
+}
+ `, name)
+}
+
+func testAccResourceILMDownsample(name string) string {
+	return fmt.Sprintf(`
+provider "elasticstack" {
+  elasticsearch {}
+}
+
+resource "elasticstack_elasticsearch_index_lifecycle" "test" {
+  name = "%s"
+
+  hot {
+    min_age = "1h"
+
+    set_priority {
+      priority = 10
+    }
+
+    rollover {
+      max_age = "1d"
+    }
+
+    downsample {
+      fixed_interval = "1d"
+      wait_timeout = "1d"
+    }
+
+    readonly {}
+  }
+
+  delete {
+    delete {}
+  }
+}
+ `, name)
+}
+
 func checkResourceILMDestroy(s *terraform.State) error {
 	client, err := clients.NewAcceptanceTestingClient()
 	if err != nil {