Alan Woodward 519d1278e2
Make FieldTypeLookup immutable (#58162) (#58411)
FieldTypeLookup maps field names to their MappedFieldTypes. In the past, due to
the presence of multiple mapping types within a single index, this had to be updated
in-place because a mapping update might only affect one type. However, now that
we only have a single type per index, we can completely rebuild the FieldTypeLookup
on each update, removing lots of concurrency worries.
2020-06-23 10:51:32 +01:00
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