Otherwise the fs repository metadata that points to non-existing location is stored in the old index cluster state, which causes warnings during OldIndexBackwardsCompatibilityTests.
This commit makes the `postings_format` and `doc_values_format` options of
mappings illegal on 2.0 and ignored on 1.x (meaning that the default postings
and doc values formats from the codec will be used in such a case).
This removes a fair amount of code.
Close#8746#9741
_id and _routing now no longer support the 'path' setting on indexes
created with 2.0. Indexes created before 2.0 still support this
setting for backcompat.
closes#6730
The `analyzer` setting is now the base setting, and `search_analyzer`
is simply an override of the search time analyzer. When setting
`search_analyzer`, `analyzer` must be set.
closes#9371
Ryan Ernst
Robert Muir
Igor Motov
Adrien Grand