Postpone notification after ACL check
Add helper to fetch ES highlights
Add custom ES analyzer for autocomplete

It uses the edge ngram tokenizer, which breaks a string into n-grams
*only* for the beginning of the word, e.g. [e], [el], [ela], [elas]...
So it won't allow matches in the middle of a word.

WIP. This is indexing every i18n field, I should limit that to a few
fields only otherwise the index size will go crazy.
Replace raw _msearch query with Elastica calls

The latest release of Elastica added support for _msearch! Before, I had
search/autocompleteAction building raw queries. Thanks @munkie!
Highlight results of the main search