[Doc] Add remove_by_pattern ingest processor (#6295)

* [Doc] Add remove_by_pattern ingest processor

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* Update _ingest-pipelines/processors/remove_by_pattern.md

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* Update _ingest-pipelines/processors/remove_by_pattern.md

Co-authored-by: Melissa Vagi <vagimeli@amazon.com>
Signed-off-by: gaobinlong <gbinlong@amazon.com>

* Update _ingest-pipelines/processors/remove_by_pattern.md

Co-authored-by: Melissa Vagi <vagimeli@amazon.com>
Signed-off-by: gaobinlong <gbinlong@amazon.com>

* Update _ingest-pipelines/processors/remove_by_pattern.md

Co-authored-by: Melissa Vagi <vagimeli@amazon.com>
Signed-off-by: gaobinlong <gbinlong@amazon.com>

* Fix typos

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* Update _ingest-pipelines/processors/remove_by_pattern.md

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Signed-off-by: Melissa Vagi <vagimeli@amazon.com>

* Update _ingest-pipelines/processors/remove_by_pattern.md

Co-authored-by: Nathan Bower <nbower@amazon.com>
Signed-off-by: Melissa Vagi <vagimeli@amazon.com>

* Update _ingest-pipelines/processors/remove_by_pattern.md

Co-authored-by: Nathan Bower <nbower@amazon.com>
Signed-off-by: Melissa Vagi <vagimeli@amazon.com>

---------

Signed-off-by: gaobinlong <gbinlong@amazon.com>
Signed-off-by: Melissa Vagi <vagimeli@amazon.com>
Co-authored-by: Melissa Vagi <vagimeli@amazon.com>
Co-authored-by: Nathan Bower <nbower@amazon.com>
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@ -113,7 +113,7 @@ The following example response confirms that the pipeline is working as expected
The following query ingests a document into an index named `testindex1`:
```json
PPUT testindex1/_doc/1?pipeline=remove_ip
PUT testindex1/_doc/1?pipeline=remove_ip
{
"ip_address": "203.0.113.1",
"name": "John Doe"

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@ -0,0 +1,133 @@
---
layout: default
title: Remove_by_pattern
parent: Ingest processors
nav_order: 225
redirect_from:
- /api-reference/ingest-apis/processors/remove_by_pattern/
---
# Remove_by_pattern processor
The `remove_by_pattern` processor removes the root-level fields from a document by using specified wildcard patterns.
## Syntax
The following is the syntax for the `remove_by_pattern` processor:
```json
{
"remove_by_pattern": {
"field_pattern": "field_name_prefix*"
}
}
```
{% include copy-curl.html %}
## Configuration parameters
The following table lists the required and optional parameters for the `remove_by_pattern` processor.
| Parameter | Required/Optional | Description |
|---|---|---|
`field_pattern` | Optional | Removes fields that match the specified pattern. All of the metadata fields, such as `_index`, `_version`, `_version_type`, and `_id`, are ignored if they match the pattern. This option only supports the root-level fields in the document. |
`exclude_field_pattern` | Optional | Removes fields that do not match the specified pattern. All of the metadata fields, such as `_index`, `_version`, `_version_type`, and `_id`, are ignored if they do not match the pattern. This option only supports the root-level fields in the document. The `field_pattern` and `exclude_field_pattern` options are mutually exclusive. |
`description` | Optional | A brief description of the processor. |
`if` | Optional | A condition for running the processor. |
`ignore_failure` | Optional | Specifies whether the processor continues execution even if it encounters errors. If set to `true`, the failure is ignored. Default is `false`. |
`on_failure` | Optional | A list of processors to run if the processor fails. |
`tag` | Optional | An identifier tag for the processor. Useful for debugging in order to distinguish between processors of the same type. |
## Using the processor
Follow these steps to use the processor in a pipeline.
**Step 1: Create a pipeline**
The following query creates a pipeline named `remove_fields_by_pattern` that removes the fields that match the pattern `foo*`:
```json
PUT /_ingest/pipeline/remove_fields_by_pattern
{
"description": "Pipeline that removes the fields by patterns.",
"processors": [
{
"remove_by_pattern": {
"field_pattern": "foo*"
}
}
]
}
```
{% include copy-curl.html %}
**Step 2 (Optional): Test the pipeline**
It is recommended that you test your pipeline before you ingest documents.
{: .tip}
To test the pipeline, run the following query:
```json
POST _ingest/pipeline/remove_fields_by_pattern/_simulate
{
"docs": [
{
"_index": "testindex1",
"_id": "1",
"_source":{
"foo1": "foo1",
"foo2": "foo2",
"bar": "bar"
}
}
]
}
```
{% include copy-curl.html %}
**Response**
The following example response confirms that the pipeline is working as expected:
```json
{
"docs": [
{
"doc": {
"_index": "testindex1",
"_id": "1",
"_source": {
"bar": "bar"
},
"_ingest": {
"timestamp": "2023-08-24T18:02:13.218986756Z"
}
}
}
]
}
```
**Step 3: Ingest a document**
The following query ingests a document into an index named `testindex1`:
```json
PUT testindex1/_doc/1?pipeline=remove_fields_by_pattern
{
"foo1": "foo1",
"foo2": "foo2",
"bar": "bar"
}
```
{% include copy-curl.html %}
**Step 4 (Optional): Retrieve the document**
To retrieve the document, run the following query:
```json
GET testindex1/_doc/1
```
{% include copy-curl.html %}