diff --git a/package.json b/package.json
index afda7cd4c9125..4679049714d1c 100644
--- a/package.json
+++ b/package.json
@@ -116,7 +116,7 @@
     "@elastic/datemath": "5.0.3",
     "@elastic/ebt": "^1.1.1",
     "@elastic/ecs": "^8.11.1",
-    "@elastic/elasticsearch": "^8.15.0",
+    "@elastic/elasticsearch": "^8.15.1",
     "@elastic/ems-client": "8.5.3",
     "@elastic/eui": "97.3.0",
     "@elastic/filesaver": "1.1.2",
diff --git a/packages/core/saved-objects/core-saved-objects-migration-server-internal/src/actions/catch_retryable_es_client_errors.test.ts b/packages/core/saved-objects/core-saved-objects-migration-server-internal/src/actions/catch_retryable_es_client_errors.test.ts
index 1aeabb7e86dea..c84b30cf15774 100644
--- a/packages/core/saved-objects/core-saved-objects-migration-server-internal/src/actions/catch_retryable_es_client_errors.test.ts
+++ b/packages/core/saved-objects/core-saved-objects-migration-server-internal/src/actions/catch_retryable_es_client_errors.test.ts
@@ -72,24 +72,25 @@ describe('catchRetryableEsClientErrors', () => {
         type: 'retryable_es_client_error',
       });
     });
-    it('ResponseError with retryable status code', async () => {
-      const statusCodes = [503, 401, 403, 408, 410, 429];
-      return Promise.all(
-        statusCodes.map(async (status) => {
-          const error = new esErrors.ResponseError(
-            elasticsearchClientMock.createApiResponse({
-              statusCode: status,
-              body: { error: { type: 'reason' } },
-            })
-          );
-          expect(
-            ((await Promise.reject(error).catch(catchRetryableEsClientErrors)) as any).left
-          ).toMatchObject({
-            message: 'reason',
-            type: 'retryable_es_client_error',
-          });
-        })
-      );
-    });
+    it.each([503, 401, 403, 408, 410, 429])(
+      'ResponseError with retryable status code (%d)',
+      async (status) => {
+        const error = new esErrors.ResponseError(
+          elasticsearchClientMock.createApiResponse({
+            statusCode: status,
+            body: { error: { type: 'reason' } },
+          })
+        );
+        expect(
+          ((await Promise.reject(error).catch(catchRetryableEsClientErrors)) as any).left
+        ).toMatchObject({
+          message:
+            status === 410
+              ? 'This API is unavailable in the version of Elasticsearch you are using.'
+              : 'reason',
+          type: 'retryable_es_client_error',
+        });
+      }
+    );
   });
 });
diff --git a/packages/kbn-apm-synthtrace/src/lib/shared/base_client.ts b/packages/kbn-apm-synthtrace/src/lib/shared/base_client.ts
index ed6d1b813184b..7fd639331af80 100644
--- a/packages/kbn-apm-synthtrace/src/lib/shared/base_client.ts
+++ b/packages/kbn-apm-synthtrace/src/lib/shared/base_client.ts
@@ -55,7 +55,6 @@ export class SynthtraceEsClient<TFields extends Fields> {
           await this.client.indices.resolveIndex({
             name: this.indices.join(','),
             expand_wildcards: ['open', 'hidden'],
-            // @ts-expect-error ignore_unavailable is not in the type definition, but it is accepted by es
             ignore_unavailable: true,
           })
         ).indices.map((index: { name: string }) => index.name)
diff --git a/x-pack/packages/ai-infra/product-doc-artifact-builder/src/tasks/install_elser.ts b/x-pack/packages/ai-infra/product-doc-artifact-builder/src/tasks/install_elser.ts
index 037a9e809d1e1..09dc85b816191 100644
--- a/x-pack/packages/ai-infra/product-doc-artifact-builder/src/tasks/install_elser.ts
+++ b/x-pack/packages/ai-infra/product-doc-artifact-builder/src/tasks/install_elser.ts
@@ -60,7 +60,6 @@ const waitUntilDeployed = async ({
       model_id: modelId,
     });
     const deploymentStats = statsRes.trained_model_stats[0]?.deployment_stats;
-    // @ts-expect-error deploymentStats.nodes not defined as array even if it is.
     if (!deploymentStats || deploymentStats.nodes.length === 0) {
       await sleep(delay);
       continue;
diff --git a/x-pack/packages/ml/random_sampler_utils/src/random_sampler_wrapper.ts b/x-pack/packages/ml/random_sampler_utils/src/random_sampler_wrapper.ts
index 5054833ac7dd0..39d26509422a2 100644
--- a/x-pack/packages/ml/random_sampler_utils/src/random_sampler_wrapper.ts
+++ b/x-pack/packages/ml/random_sampler_utils/src/random_sampler_wrapper.ts
@@ -69,7 +69,6 @@ export const createRandomSamplerWrapper = (options: RandomSamplerOptions) => {
 
     return {
       [aggName]: {
-        // @ts-expect-error `random_sampler` is not yet part of `AggregationsAggregationContainer`
         random_sampler: {
           probability,
           ...(options.seed ? { seed: options.seed } : {}),
diff --git a/x-pack/plugins/lists/server/services/utils/transform_elastic_named_search_to_list_item.ts b/x-pack/plugins/lists/server/services/utils/transform_elastic_named_search_to_list_item.ts
index 0a3632efe9195..abdffd19eca76 100644
--- a/x-pack/plugins/lists/server/services/utils/transform_elastic_named_search_to_list_item.ts
+++ b/x-pack/plugins/lists/server/services/utils/transform_elastic_named_search_to_list_item.ts
@@ -34,7 +34,7 @@ export const transformElasticNamedSearchToListItem = ({
 }: TransformElasticMSearchToListItemOptions): SearchListItemArraySchema => {
   return value.map((singleValue, index) => {
     const matchingHits = response.hits.hits.filter((hit) => {
-      if (hit.matched_queries != null) {
+      if (hit.matched_queries != null && Array.isArray(hit.matched_queries)) {
         return hit.matched_queries.some((matchedQuery) => {
           const [matchedQueryIndex] = matchedQuery.split('.');
           return matchedQueryIndex === `${index}`;
diff --git a/x-pack/plugins/ml/public/application/model_management/expanded_row.tsx b/x-pack/plugins/ml/public/application/model_management/expanded_row.tsx
index e9db6b4e4f590..f7e95e3eda52c 100644
--- a/x-pack/plugins/ml/public/application/model_management/expanded_row.tsx
+++ b/x-pack/plugins/ml/public/application/model_management/expanded_row.tsx
@@ -182,6 +182,7 @@ export const ExpandedRow: FC<ExpandedRowProps> = ({ item }) => {
           key: `${perDeploymentStat.deployment_id}_${nodeName}`,
           ...perDeploymentStat,
           ...modelSizeStats,
+          // @ts-expect-error `throughput_last_minute` is not declared in ES Types
           node: {
             ...pick(n, [
               'average_inference_time_ms',
diff --git a/x-pack/plugins/ml/server/models/model_management/memory_usage.ts b/x-pack/plugins/ml/server/models/model_management/memory_usage.ts
index 6e2931dbbe06b..6e9121a133bb8 100644
--- a/x-pack/plugins/ml/server/models/model_management/memory_usage.ts
+++ b/x-pack/plugins/ml/server/models/model_management/memory_usage.ts
@@ -181,6 +181,7 @@ export class MemoryUsageService {
 
     const mlNodes = Object.entries(response.nodes).filter(([, node]) => node.roles.includes('ml'));
 
+    // @ts-expect-error `throughput_last_minute` is not declared in ES Types
     const nodeDeploymentStatsResponses: NodeDeploymentStatsResponse[] = mlNodes.map(
       ([nodeId, node]) => {
         const nodeFields = pick(node, NODE_FIELDS) as RequiredNodeFields;
diff --git a/x-pack/plugins/security_solution/server/lib/detection_engine/rule_types/indicator_match/threat_mapping/enrich_signal_threat_matches.ts b/x-pack/plugins/security_solution/server/lib/detection_engine/rule_types/indicator_match/threat_mapping/enrich_signal_threat_matches.ts
index 8f98eab1a93e9..0d9882fe8aec3 100644
--- a/x-pack/plugins/security_solution/server/lib/detection_engine/rule_types/indicator_match/threat_mapping/enrich_signal_threat_matches.ts
+++ b/x-pack/plugins/security_solution/server/lib/detection_engine/rule_types/indicator_match/threat_mapping/enrich_signal_threat_matches.ts
@@ -24,8 +24,10 @@ export const groupAndMergeSignalMatches = (signalHits: SignalSourceHit[]): Signa
     if (existingSignalHit == null) {
       acc[signalId] = signalHit;
     } else {
-      const existingQueries = existingSignalHit?.matched_queries ?? [];
-      const newQueries = signalHit.matched_queries ?? [];
+      const existingQueries = Array.isArray(existingSignalHit?.matched_queries)
+        ? existingSignalHit.matched_queries
+        : [];
+      const newQueries = Array.isArray(signalHit.matched_queries) ? signalHit.matched_queries : [];
       existingSignalHit.matched_queries = [...existingQueries, ...newQueries];
 
       acc[signalId] = existingSignalHit;
diff --git a/x-pack/plugins/security_solution/server/lib/detection_engine/rule_types/indicator_match/threat_mapping/get_signals_map_from_threat_index.ts b/x-pack/plugins/security_solution/server/lib/detection_engine/rule_types/indicator_match/threat_mapping/get_signals_map_from_threat_index.ts
index 309516a57335c..9694d37aab0ab 100644
--- a/x-pack/plugins/security_solution/server/lib/detection_engine/rule_types/indicator_match/threat_mapping/get_signals_map_from_threat_index.ts
+++ b/x-pack/plugins/security_solution/server/lib/detection_engine/rule_types/indicator_match/threat_mapping/get_signals_map_from_threat_index.ts
@@ -90,7 +90,9 @@ export async function getSignalsQueryMapFromThreatIndex(
 
   while (maxThreatsReachedMap.size < eventsCount && threatList?.hits.hits.length > 0) {
     threatList.hits.hits.forEach((threatHit) => {
-      const matchedQueries = threatHit?.matched_queries || [];
+      const matchedQueries = Array.isArray(threatHit?.matched_queries)
+        ? threatHit.matched_queries
+        : [];
 
       matchedQueries.forEach((matchedQuery) => {
         const decodedQuery = decodeThreatMatchNamedQuery(matchedQuery);
diff --git a/x-pack/plugins/security_solution/server/lib/detection_engine/rule_types/indicator_match/threat_mapping/utils.ts b/x-pack/plugins/security_solution/server/lib/detection_engine/rule_types/indicator_match/threat_mapping/utils.ts
index da72d121c371c..347ea5d1d94c6 100644
--- a/x-pack/plugins/security_solution/server/lib/detection_engine/rule_types/indicator_match/threat_mapping/utils.ts
+++ b/x-pack/plugins/security_solution/server/lib/detection_engine/rule_types/indicator_match/threat_mapping/utils.ts
@@ -189,7 +189,9 @@ export const decodeThreatMatchNamedQuery = (encoded: string): DecodedThreatNamed
 export const extractNamedQueries = (
   hit: SignalSourceHit | ThreatListItem
 ): DecodedThreatNamedQuery[] =>
-  hit.matched_queries?.map((match) => decodeThreatMatchNamedQuery(match)) ?? [];
+  Array.isArray(hit.matched_queries)
+    ? hit.matched_queries.map((match) => decodeThreatMatchNamedQuery(match))
+    : [];
 
 export const buildExecutionIntervalValidator: (interval: string) => () => void = (interval) => {
   const intervalDuration = parseInterval(interval);
diff --git a/x-pack/plugins/security_solution/server/search_strategy/security_solution/factory/cti/event_enrichment/helpers.ts b/x-pack/plugins/security_solution/server/search_strategy/security_solution/factory/cti/event_enrichment/helpers.ts
index e15aceb8a713b..54af298d11a3e 100644
--- a/x-pack/plugins/security_solution/server/search_strategy/security_solution/factory/cti/event_enrichment/helpers.ts
+++ b/x-pack/plugins/security_solution/server/search_strategy/security_solution/factory/cti/event_enrichment/helpers.ts
@@ -46,16 +46,19 @@ export const buildIndicatorShouldClauses = (
 export const buildIndicatorEnrichments = (hits: estypes.SearchHit[]): CtiEnrichment[] => {
   return hits.flatMap<CtiEnrichment>(({ matched_queries: matchedQueries, ...hit }) => {
     return (
-      matchedQueries?.reduce<CtiEnrichment[]>((enrichments, matchedQuery) => {
-        if (isValidEventField(matchedQuery)) {
-          enrichments.push({
-            ...hit.fields,
-            ...buildIndicatorMatchedFields(hit, matchedQuery),
-          });
-        }
+      (Array.isArray(matchedQueries) ? matchedQueries : [])?.reduce<CtiEnrichment[]>(
+        (enrichments, matchedQuery) => {
+          if (isValidEventField(matchedQuery)) {
+            enrichments.push({
+              ...hit.fields,
+              ...buildIndicatorMatchedFields(hit, matchedQuery),
+            });
+          }
 
-        return enrichments;
-      }, []) ?? []
+          return enrichments;
+        },
+        []
+      ) ?? []
     );
   });
 };
diff --git a/yarn.lock b/yarn.lock
index 5faf426cf4d25..b4023f405d878 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -1721,12 +1721,12 @@
     "@elastic/transport" "^8.3.1"
     tslib "^2.4.0"
 
-"@elastic/elasticsearch@^8.15.0":
-  version "8.15.0"
-  resolved "https://registry.yarnpkg.com/@elastic/elasticsearch/-/elasticsearch-8.15.0.tgz#cb29b3ae33203c545d435cf3dc4b557c8b4961d5"
-  integrity sha512-mG90EMdTDoT6GFSdqpUAhWK9LGuiJo6tOWqs0Usd/t15mPQDj7ZqHXfCBqNkASZpwPZpbAYVjd57S6nbUBINCg==
+"@elastic/elasticsearch@^8.15.1":
+  version "8.15.1"
+  resolved "https://registry.yarnpkg.com/@elastic/elasticsearch/-/elasticsearch-8.15.1.tgz#ca294ba11ed1514bf87d4a2e253b11f6cefd8552"
+  integrity sha512-L3YzSaxrasMMGtcxnktiUDjS5f177L0zpHsBH+jL0LgPhdMk9xN/VKrAaYzvri86IlV5IbveA0ANV6o/BDUmhQ==
   dependencies:
-    "@elastic/transport" "^8.7.0"
+    "@elastic/transport" "^8.8.1"
     tslib "^2.4.0"
 
 "@elastic/ems-client@8.5.3":
@@ -1906,10 +1906,10 @@
     undici "^5.28.3"
     yaml "^2.2.2"
 
-"@elastic/transport@^8.3.1", "@elastic/transport@^8.7.0":
-  version "8.7.0"
-  resolved "https://registry.yarnpkg.com/@elastic/transport/-/transport-8.7.0.tgz#006987fc5583f61c266e0b1003371e82efc7a6b5"
-  integrity sha512-IqXT7a8DZPJtqP2qmX1I2QKmxYyN27kvSW4g6pInESE1SuGwZDp2FxHJ6W2kwmYOJwQdAt+2aWwzXO5jHo9l4A==
+"@elastic/transport@^8.3.1", "@elastic/transport@^8.8.1":
+  version "8.8.1"
+  resolved "https://registry.yarnpkg.com/@elastic/transport/-/transport-8.8.1.tgz#d64244907bccdad5626c860b492faeef12194b1f"
+  integrity sha512-4RQIiChwNIx3B0O+2JdmTq/Qobj6+1g2RQnSv1gt4V2SVfAYjGwOKu0ZMKEHQOXYNG6+j/Chero2G9k3/wXLEw==
   dependencies:
     "@opentelemetry/api" "1.x"
     debug "^4.3.4"