`max_bytes_length_exceeded_exception` causes retry loop

If the connector sends a too-long value for a field of type `keyword`, Elasticsearch responds like this:

ElasticsearchException[Elasticsearch exception [type=max_bytes_length_exceeded_exception, reason=max_bytes_length_exceeded_exception: bytes can be at most 32766 in length; got 1658739]]

When this happens, the connector should add a record to the reject log instead of retrying forever.

This error condition indicates the field's type mapping is incorrect. Possible fixes include changing the type definition from `keyword` to `text`, or adding an `ignore_above` threshold to the `keyword` field.