Add full-text and term level queries specific to Elasticsearch #5
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Summary
This pull requests deals with #1 by enabling three full-text queries in the adapter:
As a bonus, there is also one term level query thrown into the mix:
And the simplest query there is:
The implementation is fairly simple, as the existing parser for query parameters is easily extendable. I have added relevant tests.
I did not want to introduce long query names (e.g. $match_phrase_prefix) and at the same time did not want ambiguous acronyms, so went for a compromise.
Other Information
This PR also deals with testing the adapter on several versions of Elasticsearch. So far we had several branches, each for a different Es version. It was ok as a starting point, but quickly became cumbersome, so I have gathered all variations in one Travis config and slightly changed the test entry point as well as the test app in order to choose Es setup for 2.4 or 5.x based on env variable (ES_VERSION).
Docs PR already filed.