Simon Willnauer f70141c862 Only load FST off heap if we are actually using mmaps for the term dictionary (#43158)
Given the significant performance impact that NIOFS has when term dicts are
loaded off-heap this change enforces FstLoadMode#AUTO that loads term dicts
off heap only if the underlying index input indicates a memory map.

Relates to #43150
2019-06-13 07:54:02 +02:00
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