CBES-17: search for doc across all nodes

ElasticSearch has an issue where the primary/replica shards
can become inconsistent, as in the case of our topolgy tests.
This is an update to automation to make sure we haven't lost
the document altogether by looking for it across all nodes.

Change-Id: I172dc0083f62b7a79f717d47f2c68ca0f83445a1
Reviewed-on: http://review.couchbase.org/29350
Reviewed-by: Ketaki Gangal <ketakigangal@gmail.com>
Tested-by: Tommie McAfee <tommie@couchbase.com>