GitHub user sebbASF opened an issue:
https://github.com/apache/incubator-ponymail/issues/341
Make 2.1 the minimum supported version of Elasticsearch
Elasticsearch (ES) 1.x versions are no longer being developed, so it does
not make sense to continue to support 1.x unless that can be done without
compromising the ability to support the current version ES 5.x.
ES 5.x removes support for some features that were deprecated in 2.x. This
means changes are needed to the existing code-base.
ES 2.1 seems to be the first version that supports efficient scrolling when
using _doc sort order.
This is necessary to support scrolling with ES 5.x, which drops support
from the scan search type.
Also ES 2.x supports terminate_after which is needed for the word-cloud
feature in ES 5.x.
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