212 lines
4.5 KiB
Markdown
212 lines
4.5 KiB
Markdown
---
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layout: default
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title: Rename field processor
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nav_order: 20
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has_children: false
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parent: Search pipelines
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grand_parent: Search
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---
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# Rename field processor
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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.
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## Request fields
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The following table lists all available request fields.
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Field | Data type | Description
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:--- | :--- | :---
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`field` | String | The field to rename. Required.
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`target_field` | String | The new field name. Required.
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`tag` | String | The processor's identifier.
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`description` | String | A description of the processor.
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`ignore_failure` | Boolean | If `true`, OpenSearch [ignores a failure]({{site.url}}{{site.baseurl}}/search-plugins/search-pipelines/index/#ignoring-processor-failures) of this processor and continues to run the remaining processors in the search pipeline. Optional. Default is `false`.
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## Example
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The following example demonstrates using a search pipeline with a `rename_field` processor.
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### Setup
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Create an index named `my_index` and index a document with the field `message`:
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```json
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POST /my_index/_doc/1
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{
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"message": "This is a public message",
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"visibility":"public"
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}
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```
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{% include copy-curl.html %}
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### Creating a search pipeline
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The following request creates a search pipeline with a `rename_field` response processor that renames the field `message` to `notification`:
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```json
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PUT /_search/pipeline/my_pipeline
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{
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"response_processors": [
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{
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"rename_field": {
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"field": "message",
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"target_field": "notification"
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}
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}
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]
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}
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```
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{% include copy-curl.html %}
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### Using a search pipeline
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Search for documents in `my_index` without a search pipeline:
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```json
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GET /my_index/_search
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```
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{% include copy-curl.html %}
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The response contains the field `message`:
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<details open markdown="block">
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<summary>
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Response
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</summary>
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{: .text-delta}
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```json
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{
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"took" : 1,
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"timed_out" : false,
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"_shards" : {
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"total" : 1,
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"successful" : 1,
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"skipped" : 0,
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"failed" : 0
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},
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"hits" : {
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"total" : {
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"value" : 2,
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"relation" : "eq"
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},
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"max_score" : 1.0,
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"hits" : [
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{
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"_index" : "my_index",
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"_id" : "1",
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"_score" : 1.0,
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"_source" : {
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"message" : "This is a public message",
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"visibility" : "public"
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}
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}
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]
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}
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}
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```
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</details>
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To search with a pipeline, specify the pipeline name in the `search_pipeline` query parameter:
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```json
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GET /my_index/_search?search_pipeline=my_pipeline
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```
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{% include copy-curl.html %}
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The `message` field has been renamed to `notification`:
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<details open markdown="block">
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<summary>
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Response
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</summary>
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{: .text-delta}
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```json
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{
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"took" : 2,
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"timed_out" : false,
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"_shards" : {
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"total" : 1,
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"successful" : 1,
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"skipped" : 0,
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"failed" : 0
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},
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"hits" : {
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"total" : {
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"value" : 1,
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"relation" : "eq"
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},
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"max_score" : 0.0,
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"hits" : [
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{
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"_index" : "my_index",
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"_id" : "1",
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"_score" : 0.0,
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"_source" : {
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"visibility" : "public",
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"notification" : "This is a public message"
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}
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}
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]
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}
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}
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```
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</details>
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You can also use the `fields` option to search for specific fields in a document:
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```json
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POST /my_index/_search?pretty&search_pipeline=my_pipeline
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{
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"fields":["visibility", "message"]
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}
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```
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{% include copy-curl.html %}
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In the response, the field `message` has been renamed to `notification`:
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<details open markdown="block">
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<summary>
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Response
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</summary>
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{: .text-delta}
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```json
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{
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"took" : 4,
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"timed_out" : false,
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"_shards" : {
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"total" : 1,
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"successful" : 1,
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"skipped" : 0,
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"failed" : 0
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},
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"hits" : {
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"total" : {
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"value" : 1,
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"relation" : "eq"
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},
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"max_score" : 0.0,
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"hits" : [
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{
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"_index" : "my_index",
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"_id" : "1",
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"_score" : 0.0,
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"_source" : {
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"visibility" : "public",
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"notification" : "This is a public message"
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},
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"fields" : {
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"visibility" : [
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"public"
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],
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"notification" : [
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"This is a public message"
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]
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}
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}
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]
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}
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}
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```
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</details> |