Support for Update API

[MrHash]

API as described here: http://www.elasticsearch.org/guide/en/elasticsearch/reference/current/docs-update.html

[fprochazka]

What is update api, please?

[MrHash]

Added link to description. It's basically partial object updates with scripting

[MrHash]

In fact I was thinking the solution for this was to make the whole library always just use the update API because i think it can work seamlessly with using upserts http://www.elasticsearch.org/guide/en/elasticsearch/reference/current/_upserts.html