Fix fielddata handling for the _parent
field.
#12418
Merged
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Change #12371 broke fielddata on the
_parent
child for indices created before2.0. This pull request adds back caching of the
_parent
fielddata for indicescreated before 2.0 and cleans some related stuff. For instance
DocumentTypeListener doesn't need to take care of removed mappings anymore since
mappings can't be removed in 2.0.