1.0: Add OpenSearch plugin documentation

.gitbook.yaml

@@ -89,6 +89,7 @@ redirects:
   v1.0/articles/out_exec: plugins/output/exec.md
   v1.0/articles/out_mongo_replset: plugins/output/mongo_replset.md
   v1.0/articles/out_relabel: plugins/output/relabel.md
+  v1.0/articles/out_opensearch: plugins/output/opensearch.md
 
   # Plugin/Filter
   v1.0/articles/filter_geoip: plugins/filter/geoip.md

SUMMARY.md

@@ -79,6 +79,7 @@
   * [s3](output/s3.md)
   * [kafka](output/kafka.md)
   * [elasticsearch](output/elasticsearch.md)
+  * [opensearch](output/opensearch.md)
   * [mongo](output/mongo.md)
   * [mongo\_replset](output/mongo_replset.md)
   * [rewrite\_tag\_filter](output/rewrite_tag_filter.md)

output/opensearch.md

@@ -0,0 +1,163 @@
+# opensearch
+
+The `out_opensearch` Output plugin writes records into Opensearch. By default, it creates records using [bulk api](https://opensearch.org/docs/latest/opensearch/rest-api/document-apis/bulk/) which performs multiple indexing operations in a single API call. This reduces overhead and can greatly increase indexing speed. This means that when you first import records using the plugin, records are not immediately pushed to OpenSearch.
+
+Records will be sent to OpenSearch when the `chunk_keys` condition has been met. To change the output frequency, please specify the `time` in `chunk_keys` and specify `timekey` value in the configuration.
+
+This document does not describe all the parameters. For details, refer to the **Further Reading** section.
+
+## Installation
+
+Since `out_opensearch` has been included in the standard distribution of `td-agent` since v4.4.0 and the alternative distribution of `calyptia-fluentd` since v1.3.4, `td-agent`/`calyptia-fluentd` users do not need to install it manually.
+
+If you have installed Fluentd without `td-agent` or `calyptia-fluentd`, please install this plugin using `fluent-gem`:
+
+```text
+$ fluent-gem install fluent-plugin-opensearch
+```
+
+## Example Configuration
+
+Here is a simple working configuration which should serve as a good starting point for most users:
+
+```text
+<match my.logs>
+  @type opensearch
+  host localhost
+  port 9200
+  logstash_format true
+</match>
+```
+
+For more details on each option, read the section on [Parameters](opensearch.md#parameters).
+
+## Plugin Helpers
+
+* [`event_emitter`](../plugin-helper-overview/api-plugin-helper-event_emitter.md)
+* [`compat_parameters`](../plugin-helper-overview/api-plugin-helper-compat_parameters.md)
+
+## Parameters
+
+### `@type` \(required\)
+
+This option must be always `opensearch`.
+
+### `host` \(optional\)
+
+The hostname of your OpenSearch node \(default: `localhost`\).
+
+### `port` \(optional\)
+
+The port number of your OpenSearch node \(default: `9200`\).
+
+### `hosts` \(optional\)
+
+If you want to connect to more than one OpenSearch nodes, specify this option in the following format:
+
+```text
+hosts host1:port1,host2:port2,host3:port3
+# or
+hosts https://customhost.com:443/path,https://username:[email protected]:443
+```
+
+If you use this option, the `host` and `port` options are ignored.
+
+### `user`, `password` \(optional\)
+
+The login credentials to connect to the OpenSearch node \(default: `nil`\):
+
+```text
+user fluent
+password mysecret
+```
+
+### `scheme` \(optional\)
+
+Specify `https` if your OpenSearch endpoint supports SSL \(default: `http`\).
+
+### `path` \(optional\)
+
+The REST API endpoint of OpenSearch to post write requests \(default: `nil`\).
+
+### `index_name` \(optional\)
+
+The index name to write events to \(default: `fluentd`\).
+
+This option supports the placeholder syntax of Fluentd plugin API. For example, if you want to partition the index by tags, you can specify it like this:
+
+```text
+index_name fluentd.${tag}
+```
+
+Here is a more practical example which partitions the OpenSearch index by tags and timestamps:
+
+```text
+index_name fluentd.${tag}.%Y%m%d
+```
+
+Time placeholder needs to set up tag and time in `chunk_keys`. Also, it needs to specify timekey for time slice of chunk:
+
+```text
+<buffer tag, time>
+  timekey 1h # chunks per hours ("3600" also available)
+</buffer>
+```
+
+For more information about buffer options checkout the [Buffer Section Configuration](../configuration/buffer-section.md).
+
+### `logstash_format` \(optional\)
+
+If `true`, Fluentd uses the conventional index name format `logstash-%Y.%m.%d` \(default: `false`\). This option supersedes the `index_name` option.
+
+#### `@log_level` option
+
+The `@log_level` option allows the user to set different levels of logging for each plugin.
+
+Supported log levels: `fatal`, `error`, `warn`, `info`, `debug`, `trace`.
+
+Please see the [logging article](../deployment/logging.md) for further details.
+
+### `logstash_prefix` \(optional\)
+
+The logstash prefix index name to write events when `logstash_format` is `true` \(default: `logstash`\).
+
+## Miscellaneous
+
+You can use `%{}` style placeholders to escape for URL encoding needed characters.
+
+Valid configuration:
+
+```text
+user %{demo+}
+password %{@secret}
+```
+
+Valid configuration:
+
+```text
+hosts https://%{j+hn}:%{passw@rd}@host1:443/elastic/,http://host2
+```
+
+Invalid configuration:
+
+```text
+user demo+
+password @secret
+```
+
+## Common Output / Buffer parameters
+
+For common output / buffer parameters, please check the following articles:
+
+* [Output Plugin Overview](./)
+* [Buffer Section Configuration](../configuration/buffer-section.md)
+
+## Troubleshooting
+
+Please refer to the [OpenSearch's troubleshooting](https://github.com/fluent/fluent-plugin-opensearch#troubleshooting) section.
+
+## Further Reading
+
+* [`fluent-plugin-opensearch`](https://github.com/fluent/fluent-plugin-opensearch)
+
+If this article is incorrect or outdated, or omits critical information, please [let us know](https://github.com/fluent/fluentd-docs-gitbook/issues?state=open). [Fluentd](http://www.fluentd.org/) is an open-source project under [Cloud Native Computing Foundation \(CNCF\)](https://cncf.io/). All components are available under the Apache 2 License.