Return total result count for text search queries

add create/update dates to comments index, for use in statistical facets

add migrate-index.sh for simplified reindexing.

E0d/stream2es

Index and query ES using english analyzer

fixed typo

removed refactor leave behinds

missed push

cr comments

removing extra scheme part

fixed typo, clarified comment

Remove email from User model and API

It was never actually used for anything except to enforce uniqueness,
which should be done by the LMS.

upgrade tire to 0.5.2, update use of deprecated "text" search api

its value is always true regardless of cluster health, and it is removed
in ES v1.x.

Fix active threads endpoint

Previously, pagination was done before reducing from content to threads,
which meant that fewer threads than requested could be returned and that
the number of pages returned could be incorrect.

Return 404 instead of 400 when thread not found

Co-authored-by: Greg Price <gprice@edx.org>

don't require api key for heartbeat.

* don't require api key for heartbeat, nor expose tracebacks.
* add tests for heartbeat.
* fix test with hard tabs.

JIRA: FOR-96

reinstate disconnection from mongo in unicorn master thread

https://github.com/edx/cs_comments_service/commit/e61430d9438abf1db64fcac0eb9dd3e0f18a07bd was inadvertently lost in a recent change, this puts it back.

add heartbeat endpoint

use 404 when trying to GET a nonexistent user

JIRA: FOR-522

Adding additional config for production tcp listener

Working unicorn with env config.

Add test for sub-comment deletion

Add rake tasks for dealing with translations

Respect Accept-Language when getting strings