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Simulate index API

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Simulate index API

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This functionality is in technical preview and may be changed or removed in a future release. Elastic will work to fix any issues, but features in technical preview are not subject to the support SLA of official GA features.

Returns the index configuration that would be applied to the specified index from an existing index template.

POST /_index_template/_simulate_index/my-index-000001

Request

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POST /_index_template/_simulate_index/<index>

Prerequisites

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If the Elasticsearch security features are enabled, you must have the manage_index_templates or manage cluster privilege to use this API.

Path parameters

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<index>: (Required, string) Name of the index to simulate.

Query parameters

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master_timeout: (Optional, time units) Period to wait for a connection to the master node. If no response is received before the timeout expires, the request fails and returns an error. Defaults to 30s.

Response body

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overlapping

(array) Any templates that also matched the index but were superseded by a higher-priority template. Response includes an empty array if there are no overlapping templates.

Properties of overlapping

name: (string) Name of the superseded template.
index_patterns: (array) Index patterns that the superseded template applies to.

template

(object) The settings, mappings, and aliases that would be applied to the index.

Properties of template

aliases

(object) Aliases for the index. If no aliases apply, the response returns an empty aliases object.

<alias>

(object) The key is the alias name. The object body contains options for the alias.

Properties of <alias>

filter: (Query DSL object) Query used to limit documents the alias can access.
index_routing: (string) Value used to route indexing operations to a specific shard. This overwrites the routing value for indexing operations.
is_hidden: (Boolean) If true, the alias is hidden.
is_write_index: (Boolean) If true, the index is the write index for the alias.
routing: (string) Value used to route indexing and search operations to a specific shard.
search_routing: (string) Value used to route search operations to a specific shard. This overwrites the routing value for search operations.

mappings

(Optional, mapping object) Mapping for fields in the index. If specified, this mapping can include:

See Mapping.

Omitted from the response if no mappings would be applied.

settings

(Optional, index setting object) Configuration options for the index. See Index Settings.

Response includes an empty object if no settings would be applied.

Examples

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The following example shows the configuration that would be applied to my-index-000001 by an existing template.

PUT /_component_template/ct1                    
{
  "template": {
    "settings": {
      "index.number_of_shards": 2
    }
  }
}

PUT /_component_template/ct2                    
{
  "template": {
    "settings": {
      "index.number_of_replicas": 0
    },
    "mappings": {
      "properties": {
        "@timestamp": {
          "type": "date"
        }
      }
    }
  }
}

PUT /_index_template/final-template             
{
  "index_patterns": ["my-index-*"],
  "composed_of": ["ct1", "ct2"],
  "priority": 5
}

POST /_index_template/_simulate_index/my-index-000001

	Create a component template (`ct1`) that sets the number of shards to 2
	Create a second component template (`ct2`) that sets the number of replicas to 0 and defines a mapping
	Create an index template (`final-template`) that uses the component templates
	Show the configuration that would be applied to `my-index-000001`

The response shows the index settings, mappings, and aliases applied by the final-template:

{
  "template" : {
    "settings" : {
      "index" : {
        "number_of_shards" : "2",
        "number_of_replicas" : "0",
        "routing" : {
          "allocation" : {
            "include" : {
              "_tier_preference" : "data_content"
            }
          }
        }
      }
    },
    "mappings" : {
      "properties" : {
        "@timestamp" : {
          "type" : "date"
        }
      }
    },
    "aliases" : { }
  },
  "overlapping" : [
    {
      "name" : "template_1",
      "index_patterns" : [
        "my-index-*"
      ]
    }
  ]
}

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