Github user sebbASF commented on the issue:
https://github.com/apache/incubator-ponymail/issues/334
There does not seem to be an efficient way to fix this without using
search_after, which requires ES 5.x.
For most efficient scrolling, the query must use _doc order (*). This means
that the first N results won't in general be the same as the corresponding
query using the desired sort order.
For versions before ES 5.x, it looks like the only options are:
- use the 'wrong' sort order for the scroll, probably causing performance
issues
- stop scrolling early; this will likely skew the results.
- ignore the problem
(*) this is not a problem when scrolling is used as intended - i.e. to
process all matching documents.
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