OpenSearch

PUT _ingest/pipeline/<pipeline_name>
{
  "description": "<description>",
  "processors": [
    {
      "grok": {
        "field": "message",
        "patterns": [
          "%{MONTHDAY}-%{MONTH}-%{YEAR} %{TIME} %{INT:PID} %{USERNAME} %{LOGLEVEL:loglevel} %{WORD:function} %{URIPATHPARAM:request}"
        ]
      }
    }
  ]
}

GET /_cat/indices?v
GET /_cluster/health
GET /_cluster/settings?include_defaults=true
GET /_cat/shards/<index name>?v
GET /_cat/indices/<index name>?v

PUT /_cluster/settings
{
  "persistent": {
    "cluster.max_shards_per_node" <value>
  }
}

PUT /_cluster/settings
{
  "transient": {
    "action.destructive_requires_name": true
  }
}

DELETE /<mask>

PUT /_cluster/settings
{
  "transient": {
    "action.destructive_requires_name": false
  }
}

POST /<index name>_close
POST /<index name>_open

PORST _plugins/_ism/add/<mask>
{
  "policy_id": "<policy name>"
}

GET /<index name>/_settings

PUT /<index name>/_settings
{
  "index": {
    "blocks": {
      "read_only_allow_delete": false
    }
  }
}

PUT /_all/_settings
{
  "index": {
    "blocks": {
      "read_only_allow_delete": false
    }
  }
}