Elastica 6.1.1 (download).

This release is compatible with Elasticsearch 6.x and was tested with elasticsearch 6.5.2.

Added

• Added BucketSelector aggregation #1554
• Added DerivativeAggregation #1553
• The preferred type name is _doc, so that index APIs have the same path as they will have in 7.0
• Introduced new version of PHP-CS-Fixer and new Lint travis step. #1555

Improvements

• Reduced memory footprint of response by not keeping the raw JSON data when JSON after JSON has been parsed. #1588