Added support for GetFieldMapping

Elasticsearch v0.90.6
See elasticsearch/elasticsearch@8819f91d4761b62fced5aea376a7cbd294dfa80d
Added support for highlightQuery and highlighterNoMatchSize params in search

Elasticsearch v0.90.6

See elasticsearch/elasticsearch@6b000d8c6d7f0162b6c3d9771785f2bcba508fbf and elasticsearch/elasticsearch@14a709f563a264c4371392e31c7bee9d26758056
Added support for segments stats

Elasticsearch v0.90.7
See elasticsearch/elasticsearch@c95c7096e50d329d4591913bf1b3e5c58d3a6065
Added support for cluster stats

Elasticsearch v0.90.8
See elasticsearch/elasticsearch@2b6214cff72423fc5c948c7b4c39027c93494400