Curator-opensearch

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**Bug Fixes**

* Mock and cx_Freeze don't play well together. Packages weren't working, so
I reverted the string-based comparison as before.

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**New Features**

* Index Settings are here! First requested as far back as 160, it's been
requested in various forms culminating in 656. The official documentation
addresses the usage. (untergeek)
* Remote reindex now adds the ability to migrate from one cluster to another,
preserving the index names, or optionally adding a prefix and/or a suffix.
The official documentation shows you how. (untergeek)
* Added support for naming rollover indices. 970 (jurajseffer)
* Testing against ES 5.4.1, 5.3.3

**Bug Fixes**

* Since Curator no longer supports old versions of python, convert tests to
use ``isinstance``. 973 (untergeek)
* Fix stray instance of ``is not`` comparison instead of ``!=`` 972
(untergeek)
* Increase remote client timeout to 180 seconds for remote reindex. 930
(untergeek)

**General**

* elasticsearch-py dependency bumped to 5.4.0
* Added mock dependency due to isinstance and testing requirements
* AWS ES 5.3 officially supports Curator now. Documentation has been updated
to reflect this.

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**Bug Fixes**

* The ``_recovery`` check needs to compare using ``!=`` instead of
``is not``, which apparently does not accurately compare unicode strings.
Reported in 966 (untergeek)

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**Bug Fixes**

* Restoring a snapshot on an exceptionally fast cluster/node can create a
race condition where a ``_recovery`` check returns an empty dictionary
``{}``, which causes Curator to fail. Added test and code to correct this.
Reported in 962. (untergeek)

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**Bug Fixes**

* Nasty bug in schema validation fixed where boolean options or filter flags
would validate as ``True`` if non-boolean types were submitted.
Reported in 945. (untergeek)
* Check for presence of alias after reindex, in case the reindex was to an
alias. Reported in 941. (untergeek)
* Fix an edge case where an index named with `1970.01.01` could not be sorted
by index-name age. Reported in 951. (untergeek)
* Update tests to include ES 5.3.2
* Bump certifi requirement to 2017.4.17.

**Documentation**

* Document substitute strftime symbols for doing ISO Week timestrings added
in 932. (untergeek)
* Document how to include file paths better. Fixes 944. (untergeek)

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**Bug Fixes**

* Fixed default values for ``include_global_state`` on the restore
action to be in line with defaults in Elasticsearch 5.3

**Documentation**

* Huge improvement to documenation, with many more examples.
* Address age filter limitations per 859 (untergeek)
* Address date matching behavior better per 858 (untergeek)