Rename field processor

This is an experimental feature and is not recommended for use in a production environment. For updates on the progress of the feature or if you want to leave feedback, join the discussion in the OpenSearch forum.

The rename_field search response processor intercepts a search response and renames the specified field. This is useful when your index and your application use different names for the same field. For example, if you rename a field in your index, the rename_field processor can change the new name to the old one before sending the response to your application.

Request fields

The following table lists all available request fields.

Example

The following example demonstrates using a search pipeline with a rename_field processor.

Setup

Create an index named my_index and index a document with the field message:

POST /my_index/_doc/1
{
  "message": "This is a public message", 
  "visibility":"public"
}

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Creating a search pipeline

The following request creates a search pipeline with a rename_field response processor that renames the field message to notification:

PUT /_search/pipeline/my_pipeline
{
  "response_processors": [
    {
      "rename_field": {
        "field": "message",
        "target_field": "notification"
      }
    }
  ]
}

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Using a search pipeline

Search for documents in my_index without a search pipeline:

GET /my_index/_search

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The response contains the field message:

Response

{
  "took" : 1,
  "timed_out" : false,
  "_shards" : {
    "total" : 1,
    "successful" : 1,
    "skipped" : 0,
    "failed" : 0
  },
  "hits" : {
    "total" : {
      "value" : 2,
      "relation" : "eq"
    },
    "max_score" : 1.0,
    "hits" : [
      {
        "_index" : "my_index",
        "_id" : "1",
        "_score" : 1.0,
        "_source" : {
          "message" : "This is a public message",
          "visibility" : "public"
        }
      }
    ]
  }
}

To search with a pipeline, specify the pipeline name in the search_pipeline query parameter:

GET /my_index/_search?search_pipeline=my_pipeline

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The message field has been renamed to notification:

Response

{
  "took" : 2,
  "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" : {
          "visibility" : "public",
          "notification" : "This is a public message"
        }
      }
    ]
  }
}

You can also use the fields option to search for specific fields in a document:

POST /my_index/_search?pretty&search_pipeline=my_pipeline
{
    "fields":["visibility", "message"]
}

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In the response, the field message has been renamed to notification:

Response

{
  "took" : 4,
  "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" : {
          "visibility" : "public",
          "notification" : "This is a public message"
        },
        "fields" : {
          "visibility" : [
            "public"
          ],
          "notification" : [
            "This is a public message"
          ]
        }
      }
    ]
  }
}