Include 'Content-Type' header in transport_options
#250
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Starting with Elasticsearch 5.3, (REST) requests without an explicit Content-Type are deprecated and Elasticsearch will log a warning for every request that is sent without a Content-Type header.
I addressed this in a similar manner to how
elasticsearch-ruby
did, see 1, 2.(check all that apply)
version
in gemspec are untouchedelasticsearch_dynamic
(not required but recommended)