Kinto-elasticsearch

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- Nothing changed yet.

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**Bug fixes**

- Fix the reindex get_paginated_records function. (fixes 61)

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**New features**

- Add StatsD timer to measure E/S indexation (fixes 54)
- Add a ``kinto-reindex`` command to reindex existing collections of records (fixes 56)

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**Bug fixes**

- Fix the number of results when specified in query (ref 45)

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**Bug fixes**

- Limit the number of results returned by default (fixes 45)
- Fix crash on search parse exceptions (fixes 44)

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**New features**

- Flush indices when server is flushed (fixes 4)
- Perform insertions and deletion in bulk for better efficiency (fixes 5)
- Add setting to force index refresh on change (fixes 6)
- Add heartbeat (fixes 3)
- Delete indices when buckets and collections are deleted (fixes 21)
- Support quick search from querystring (fixes 34)
- Return details about invalid queries in request body (fixes 23)
- Support defining mapping from the ``index:schema`` property in the collection metadata (ref 8)

**Bug fixes**

- Only index records if the storage transaction is committed (fixes 15)
- Do not allow to search if no read permission on collection or bucket (fixes 7)
- Fix empty results response when plugin was enabled after collection creation (ref 20)

**Internal changes**

- Create index when collection is created (fixes 27)