custom Metadata
Setter for customMetadata.
customMetadata: Optional. User provided custom metadata stored as key-value pairs used for querying. A `Document` can have a maximum of 20 `CustomMetadata`.
@CanIgnoreReturnValue()
Setter for customMetadata builder.
customMetadata: Optional. User provided custom metadata stored as key-value pairs used for querying. A `Document` can have a maximum of 20 `CustomMetadata`.