Convert
The convert processor converts a field in a document to a different type, for example, a string to an integer or an integer to a string. For an array field, all values in the array are converted. The following is the syntax for the convert processor:
{
"convert": {
"field": "field_name",
"type": "type-value"
}
}
Configuration parameters
The following table lists the required and optional parameters for the convert processor.
| Parameter | Required | Description |
|---|---|---|
field | Required | The name of the field that contains the data to be converted. Supports template snippets. |
type | Required | The type to convert the field value to. The supported types are integer, long, float, double, string, boolean, ip, and auto. If the type is boolean, the value is set to true if the field value is a string true (ignoring case) and to false if the field value is a string false (ignoring case). If the value is not one of the allowed values, an error will occur. |
description | Optional | A brief description of the processor. |
if | Optional | A condition for running this processor. |
ignore_failure | Optional | If set to true, failures are ignored. Default is false. |
ignore_missing | Optional | If set to true, the processor does not modify the document if the field does not exist or is null. 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 to distinguish between processors of the same type. |
target_field | Optional | The name of the field in which to store the parsed data. If not specified, the value will be stored in the field field. Default is field. |
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 convert-price, that converts price to a floating-point number, stores the converted value in the price_float field, and sets the value to 0 if it is less than 0:
PUT _ingest/pipeline/convert-price
{
"description": "Pipeline that converts price to floating-point number and sets value to zero if price less than zero",
"processors": [
{
"convert": {
"field": "price",
"type": "float",
"target_field": "price_float"
}
},
{
"set": {
"field": "price",
"value": "0",
"if": "ctx.price_float < 0"
}
}
]
}
Step 2 (Optional): Test the pipeline.
It is recommended that you test your pipeline before you ingest documents.
To test the pipeline, run the following query:
POST _ingest/pipeline/convert-price/_simulate
{
"docs": [
{
"_index": "testindex1",
"_id": "1",
"_source": {
"price": "-10.5"
}
}
]
}
Response
The following example response confirms that the pipeline is working as expected:
{
"docs": [
{
"doc": {
"_index": "testindex1",
"_id": "1",
"_source": {
"price_float": -10.5,
"price": "0"
},
"_ingest": {
"timestamp": "2023-08-22T15:38:21.180688799Z"
}
}
}
]
}
Step 3: Ingest a document.
The following query ingests a document into an index named testindex1:
PUT testindex1/_doc/1?pipeline=convert-price
{
"price": "10.5"
}
Step 4 (Optional): Retrieve the document.
To retrieve the document, run the following query:
GET testindex1/_doc/1