# DataSourceToIndexFieldMappingProperty

Maps a column or attribute in the data source to an index field.

You must first create the fields in the index using the [UpdateIndex](https://docs.aws.amazon.com/kendra/latest/dg/API_UpdateIndex.html) operation.

- Source: Generated code
- Type last changed: v2.93.0 · 23 Aug 2023

## Example

```ts
// The code below shows an example of how to instantiate this type.
// The values are placeholders you should change.
import { aws_kendra as kendra } from 'aws-cdk-lib';
const dataSourceToIndexFieldMappingProperty: kendra.CfnDataSource.DataSourceToIndexFieldMappingProperty = {
  dataSourceFieldName: 'dataSourceFieldName',
  indexFieldName: 'indexFieldName',

  // the properties below are optional
  dateFieldFormat: 'dateFieldFormat',
};
```

## Properties

- `dataSourceFieldName`: string (required) — The name of the field in the data source.

  You must first create the index field using the `UpdateIndex` API.

- `dateFieldFormat`: string — The format for date fields in the data source.

  If the field specified in `DataSourceFieldName` is a date field, you must specify the date format. If the field is not a date field, an exception is thrown.

- `indexFieldName`: string (required) — The name of the index field to map to the data source field.

  The index field type must match the data source field type.