Allow _version to use disk
as a doc values format.
#6523
Closed
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VersionFieldMapper.defaultDocValuesFormat claims that the default is
disk
(which is wrong, it's using Lucene's defaults).
This is not used to choose the DV format in the index but for mappings
serialization in order to know when the _version doc values format is
different from the default format. This made it impossible to use the
disk
doc values format since mappings would never retain that information at
serialization time.