From the Elasticsearch documentation:

If no fields are provided, the multi_match query defaults to the
`index.query.default_field` index settings, which in turn defaults to
`*`. `*` extracts all fields in the mapping that are eligible to term
queries and filters the metadata fields. All extracted fields are then
combined to build a query.

* Added relation parameter for pre-indexed geo_shape query

Fixes #289.

* Update .travis.yml

Added conditional to check for `GITHUB_COMPOSER_AUTH` env var

* added new NestedSort for replacing deprecated nested_filter and nested_path

* made the filter optional

* Add getQuery Method to FunctionScoreQuery

Add getQuery Method to FunctionScoreQuery in order to apply changes to query of FunctionScoreQuery.

* Update FunctionScoreQuery.php

Changed coveralls to codecov