Simon Willnauer 41a9f3ae3b Use reader attributes to control term dict memory useage (#42838)
This change makes use of the reader attributes added in LUCENE-8671
to ensure that `_id` fields are always on-heap for best update performance
and term dicts are generally off-heap on Read-Only engines.

Closes #38390
2019-06-05 11:01:06 +02:00
..