Ingest changes

Timestamp meta-data field type has changed

The type of the "timestamp" meta-data field has changed from java.lang.String to java.util.Date.

The format of the string-formatted ingest.timestamp field has changed

Previously, since Elasticsearch 5.4.0, you needed to use ingest.new_date_format to have the ingest.timestamp metadata field be formatted in such a way that ES can coerce it to a field of type date without further transformation. This is not necessary anymore and this setting was removed. You can now simply set a field to {{ingest.timestamp}} in a pipeline, and have that field be of type date without any mapping errors.