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Showing content from https://opensearch.org/docs/latest/api-reference/index-apis/create-index/ below:

Create index - OpenSearch Documentation

Create Index API

Introduced 1.0

While you can create an index by using a document as a base, you can also create an empty index for later use.

When creating an index, you can specify its mappings, settings, and aliases.

Endpoints Index naming restrictions

OpenSearch indexes have the following naming restrictions:

Path parameters Query parameters

You can include the following query parameters in your request. All parameters are optional.

Parameter Type Description wait_for_active_shards String Specifies the number of active shards that must be available before OpenSearch processes the request. Default is 1 (only the primary shard). Set to all or a positive integer. Values greater than 1 require replicas. For example, if you specify a value of 3, the index must have two replicas distributed across two additional nodes for the request to succeed. cluster_manager_timeout Time How long to wait for a connection to the cluster manager node. Default is 30s. timeout Time How long to wait for the request to return. Default is 30s. Request body

As part of your request, you can optionally specify index settings, mappings, aliases, and index context.

Example request 
PUT /sample-index1
{
  "settings": {
    "index": {
      "number_of_shards": 2,
      "number_of_replicas": 1
    }
  },
  "mappings": {
    "properties": {
      "age": {
        "type": "integer"
      }
    }
  },
  "aliases": {
    "sample-alias1": {}
  }
}

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