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Rename field processor
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.
| Field | Data type | Description |
|---|---|---|
field | String | The field to rename. Required. |
target_field | String | The new field name. Required. |
tag | String | The processor’s identifier. |
description | String | A description of the processor. |
ignore_failure | Boolean | If true, OpenSearch ignores a failure of this processor and continues to run the remaining processors in the search pipeline. Optional. Default is false. |
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"
}
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"
}
}
]
}
Using a search pipeline
Search for documents in my_index without a search pipeline:
GET /my_index/_search
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
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"]
}
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"
]
}
}
]
}
}