Log Message:
Update to 1.20
--------------
1.20    2015-05-17
        Deprecated:
        * Search::Elasticsearch::Client::Direct in favour of
          Search::Elasticsearch::Client::1_0::Direct

        New features:
        * Added support for structured JSON exceptions in Elasticsearch 2.0
        * Added support for plugins
        * Added Search::Elasticsearch::Client::2_0::Direct for the upcoming
          Elasticsearch 2.0 with these changes:
            * removed delete_by_query()
            * removed termvector()
            * removed indices.delete_mapping()
            * removed nodes.shutdown()
            * removed indices.status()
            * added terminate_after param to search()
            * added dfs param to termvectors()
            * removed filter_keys param from indices.clear_cache()
            * removed full param from indices.flush()
            * removed force param from indics.optmize()
            * removed replication param from all CRUD methods
            * removed mlt() method

        Bug fix:
        * The bulk buffer was being cleared on a NoNodes exception

        Added class:
        Added methods:
        * field_stats()

        Added params:
        * allow_no_indices, expand_wildcards, ignore_unavailable to cluster.state()
        * fielddata_fields to search()
        * master_timeout to indices.get_template() and indices.exists_template()
        * detect_noop to update()
        * only_ancient_segments to upgrade()
        * analyze_wildcards, analyzer, default_operator, df, lenient, \ 
lowercase_expanded_terms,
          and q to count(), search_exists() and indices.validate_query()

        Removed methods:
        * benchmark.* - never released in Elasticsearch

        Also:
        * arrays of enum query string params are now flattened as CSV
        * enum expand_wildcards also accepts: none, all
        * Search::Elasticsearch is no longer a Moo class
        * Updated elasticsearch.org URLs to use elastic.co instead
        * the request body is retained in exceptions
        * upgraded Hijk to 0.20