Curator-opensearch

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**Security Fix**

Evidently, there were some upstream dependencies which required vulnerable
versions of ``urllib3`` and ``requests``. These have been addressed.

* CVE-2018-20060, CVE-2019-11324, CVE-2018-18074 are addressed by this
update. Fixed in 1395 (cburgess)

**Bug Fixes**

* Allow aliases in Elasticsearch versions >= 6.5.0 to refer to more than one
index, if ``is_write_index`` is present and one index has it set to `True`.
Requested in 1342 (untergeek)

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This has to be a new record with 5 releases in 3 days, however, as a wonderful
aside, this release is the Curator Haiku release (if you don't know why, look
up the structure of a Haiku).

**Bug Fix**

* Persistent ILM filter error has finally been caught. Apparently, in Python,
a list of lists ``[[]]`` will evaluate as existing, because it has one
array element, even if that element is empty. So, this is my bad, but it is
fixed now. (untergeek)

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**Bug Fix**

* ILM filter was reading from full index list, rather than the working list
Reported in 1389 (untergeek)

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**Bug Fix**

* Still further package collisions with ``urllib3`` between ``boto3`` and
``requests``. It was working, but with an unacceptable error, which is
addressed in release 5.7.3. (untergeek)

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**Bug Fix**

* Fix ``urllib3`` dependency collision on account of ``boto3`` (untergeek)