Refactored put mapping api to make use of the new recently introduced generic ack mechanism

Note: we were previously waiting for ack only from all nodes that contain shards for the indices that the mapping updatewas applied to. This change introduces a wait for ack from all nodes, consitent with other api as the ack is meant more on the cluster state itself, which is held by all nodes and needs to be updated on all nodes anyway.

Closes #4228
fixed typos in terms facet documentation
fixed typo in TestCluster
test classes cleanup (fixed warnings and typos)
Add line feed for prettified main REST action