Simulate pipeline
Use the simulate ingest pipeline API operation to run or test the pipeline.
Path and HTTP methods
The following requests simulate the latest ingest pipeline created:
GET _ingest/pipeline/_simulate
POST _ingest/pipeline/_simulate
The following requests simulate a single pipeline based on the pipeline ID:
GET _ingest/pipeline/<pipeline-id>/_simulate
POST _ingest/pipeline/<pipeline-id>/_simulate
Request body fields
The following table lists the request body fields used to run a pipeline.
| Field | Required | Type | Description |
|---|---|---|---|
docs | Required | Array | The documents to be used to test the pipeline. |
pipeline | Optional | Object | The pipeline to be simulated. If the pipeline identifier is not included, then the response simulates the latest pipeline created. |
The docs field can include subfields listed in the following table.
| Field | Required | Type | Description |
|---|---|---|---|
source | Required | Object | The document’s JSON body. |
id | Optional | String | A unique document identifier. The identifier cannot be used elsewhere in the index. |
index | Optional | String | The index where the document’s transformed data appears. |
Query parameters
The following table lists the query parameters for running a pipeline.
| Parameter | Type | Description |
|---|---|---|
verbose | Boolean | Verbose mode. Display data output for each processor in the executed pipeline. |
Example: Specify a pipeline in the path
POST /_ingest/pipeline/my-pipeline/_simulate
{
"docs": [
{
"_index": "my-index",
"_id": "1",
"_source": {
"grad_year": 2024,
"graduated": false,
"name": "John Doe"
}
},
{
"_index": "my-index",
"_id": "2",
"_source": {
"grad_year": 2025,
"graduated": false,
"name": "Jane Doe"
}
}
]
}
The request returns the following response:
{
"docs": [
{
"doc": {
"_index": "my-index",
"_id": "1",
"_source": {
"name": "JOHN DOE",
"grad_year": 2023,
"graduated": true
},
"_ingest": {
"timestamp": "2023-06-20T23:19:54.635306588Z"
}
}
},
{
"doc": {
"_index": "my-index",
"_id": "2",
"_source": {
"name": "JANE DOE",
"grad_year": 2023,
"graduated": true
},
"_ingest": {
"timestamp": "2023-06-20T23:19:54.635746046Z"
}
}
}
]
}
Example: Verbose mode
When the previous request is run with the verbose parameter set to true, the response shows the sequence of transformations for each document. For example, for the document with the ID 1, the response contains the results of applying each processor in the pipeline in sequence:
{
"docs": [
{
"processor_results": [
{
"processor_type": "set",
"status": "success",
"description": "Sets the graduation year to 2023",
"doc": {
"_index": "my-index",
"_id": "1",
"_source": {
"name": "John Doe",
"grad_year": 2023,
"graduated": false
},
"_ingest": {
"pipeline": "my-pipeline",
"timestamp": "2023-06-20T23:23:26.656564631Z"
}
}
},
{
"processor_type": "set",
"status": "success",
"description": "Sets 'graduated' to true",
"doc": {
"_index": "my-index",
"_id": "1",
"_source": {
"name": "John Doe",
"grad_year": 2023,
"graduated": true
},
"_ingest": {
"pipeline": "my-pipeline",
"timestamp": "2023-06-20T23:23:26.656564631Z"
}
}
},
{
"processor_type": "uppercase",
"status": "success",
"doc": {
"_index": "my-index",
"_id": "1",
"_source": {
"name": "JOHN DOE",
"grad_year": 2023,
"graduated": true
},
"_ingest": {
"pipeline": "my-pipeline",
"timestamp": "2023-06-20T23:23:26.656564631Z"
}
}
}
]
}
]
}
Example: Specify a pipeline in the request body
Alternatively, you can specify a pipeline directly in the request body without first creating a pipeline:
POST /_ingest/pipeline/_simulate
{
"pipeline" :
{
"description": "Splits text on whitespace characters",
"processors": [
{
"csv" : {
"field" : "name",
"separator": ",",
"target_fields": ["last_name", "first_name"],
"trim": true
}
},
{
"uppercase": {
"field": "last_name"
}
}
]
},
"docs": [
{
"_index": "second-index",
"_id": "1",
"_source": {
"name": "Doe,John"
}
},
{
"_index": "second-index",
"_id": "2",
"_source": {
"name": "Doe, Jane"
}
}
]
}
Response
The request returns the following response:
{
"docs": [
{
"doc": {
"_index": "second-index",
"_id": "1",
"_source": {
"name": "Doe,John",
"last_name": "DOE",
"first_name": "John"
},
"_ingest": {
"timestamp": "2023-08-24T19:20:44.816219673Z"
}
}
},
{
"doc": {
"_index": "second-index",
"_id": "2",
"_source": {
"name": "Doe, Jane",
"last_name": "DOE",
"first_name": "Jane"
},
"_ingest": {
"timestamp": "2023-08-24T19:20:44.816492381Z"
}
}
}
]
}