Remove elasticsearch logs from failed test output
Remove elasticsearch logs from failed test output

Elasticsearch client creates a lot of debug output that is captured
by nosetests and displayed on test failure. The output makes it
harder to see the failure reason, so disabling it by default.

RichardKnop/digitalmarketplace-search-api,alphagov/digitalmarketplace-search-api,RichardKnop/digitalmarketplace-search-api,alphagov/digitalmarketplace-search-api,RichardKnop/digitalmarketplace-search-api,RichardKnop/digitalmarketplace-search-api