Mapping: Posting a mapping with default analyzer fails

[hungryblank]

Seems like reposting a mapping explicitly mentioning the default analyzer throws an error when it should not
with the following mapping.json

{"foobar":{"dynamic":false,"properties":{"description": {
  "index":"analyzed",
  "analyzer":"default",
  "type":"string"}}}}

putting the mapping the 1st time everything goes well

curl -XPUT -d @mapping.json http://localhost:9200/twitter/foobar/_mapping

{"ok":true,"acknowledged":true}

but the second time
curl -XPUT -d @mapping.json http://localhost:9200/twitter/foobar/_mapping

{"error":"MergeMappingException[Merge failed with failures {[mapper [description] has different index_analyzer, mapper [description] has different search_analyzer]}]","status":400}

with this mapping instead there's no problem posting it over and over

{"foobar":{"dynamic":false,"properties":{"description": {
  "index":"analyzed",
  "analyzer":"english",
  "type":"string"}}}}

so seems like for some reason the default analyzer is not considered to be equal to itself

[nwarz]

Just submitted PR #7902. Looks like there's only one point where null index analyzers and "default"-named index analyzers were being treated as nonequivalent.

[colings86]

closed using #7902