elasticsearch/elasticsearch — pull request #8426 by brwe (2014-11-10 18:17:56+00:00)
Title: [root mappers] fix conflict when updating mapping with _all disabled

_all reports a conflict since #7377. However, it was not checked if _all
was actually configured in the updated mapping. Therefore whenever _all
was disabled a mapping could not be updated unless _all was again added to the
updated mapping.
Also, add enabled setting to mapping always whenever enabled was set explicitely.

closes #8423