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You're viewing version 2.16 of the OpenSearch documentation. This version is no longer maintained. For the latest version, see the current documentation. For information about OpenSearch version maintenance, see Release Schedule and Maintenance Policy.

Using a search pipeline

You can use a search pipeline in the following ways:

Specifying an existing search pipeline for a request

After you create a search pipeline, you can use the pipeline with a query by specifying the pipeline name in the search_pipeline query parameter:

GET /my_index/_search?search_pipeline=my_pipeline

For a complete example of using a search pipeline with a filter_query processor, see filter_query processor example.

Using a temporary search pipeline for a request

As an alternative to creating a search pipeline, you can define a temporary search pipeline to be used for only the current query:

POST /my-index/_search
{
  "query" : {
    "match" : {
      "text_field" : "some search text"
    }
  },
  "search_pipeline" : {
    "request_processors": [
      {
        "filter_query" : {
          "tag" : "tag1",
          "description" : "This processor is going to restrict to publicly visible documents",
          "query" : {
            "term": {
              "visibility": "public"
            }
          }
        }
      }
    ],
    "response_processors": [
      {
        "rename_field": {
          "field": "message",
          "target_field": "notification"
        }
      }
    ]
  }
}

With this syntax, the pipeline does not persist and is used only for the query for which it is specified.

Default search pipeline

For convenience, you can set a default search pipeline for an index. Once your index has a default pipeline, you don’t need to specify the search_pipeline query parameter in every search request.

Setting a default search pipeline for an index

To set a default search pipeline for an index, specify the index.search.default_pipeline in the index’s settings:

PUT /my_index/_settings 
{
  "index.search.default_pipeline" : "my_pipeline"
}

After setting the default pipeline for my_index, you can try the same search for all documents:

GET /my_index/_search

The response contains only the public document, indicating that the pipeline was applied by default:

Response 
{
  "took" : 19,
  "timed_out" : false,
  "_shards" : {
    "total" : 1,
    "successful" : 1,
    "skipped" : 0,
    "failed" : 0
  },
  "hits" : {
    "total" : {
      "value" : 1,
      "relation" : "eq"
    },
    "max_score" : 0.0,
    "hits" : [
      {
        "_index" : "my_index",
        "_id" : "1",
        "_score" : 0.0,
        "_source" : {
          "message" : "This is a public message",
          "visibility" : "public"
        }
      }
    ]
  }
}

You can search across multiple indexes that share the same default pipeline. For example, alias1 has two indexes, my_index1 and my_index2, both of which have the default pipeline my_pipeline attached to them:

GET /alias1/_search

The response includes only the public version of the document, confirming that the default pipeline was successfully applied:

Response 
{
    "took": 59,
    "timed_out": false,
    "_shards": {
        "total": 2,
        "successful": 2,
        "skipped": 0,
        "failed": 0
    },
    "hits": {
        "total": {
            "value": 1,
            "relation": "eq"
        },
        "max_score": 0.0,
        "hits": [
            {
                "_index": "my_index1",
                "_id": "1",
                "_score": 0.0,
                "_source": {
                    "message": "This is a public message",
                    "visibility": "public"
                }
            }
        ]
    }
}

Disabling the default pipeline for a request

If you want to run a search request without applying the default pipeline, you can set the search_pipeline query parameter to _none:

GET /my_index/_search?search_pipeline=_none

Removing the default pipeline

To remove the default pipeline from an index, set it to null or _none:

PUT /my_index/_settings 
{
  "index.search.default_pipeline" : null
}


PUT /my_index/_settings 
{
  "index.search.default_pipeline" : "_none"
}

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