This object enables you to specify a JSON path to extract from the event and use as the partition key for the Amazon Kinesis
so that you can control the shard to which the event goes. If you do not include this parameter,
the default is to use the
eventId as the partition key.
The JSON path to be extracted from the event and used as the partition key. For more information, see Amazon Kinesis Streams Key Concepts in the Amazon Kinesis Streams Developer Guide.
Length Constraints: Maximum length of 256.
For more information about using this API in one of the language-specific AWS SDKs, see the following: