Nik Everett 02761f5fe0 Docs: migration notes for _timestamp and _ttl
We aren't able to actually create an index with _timestamp enabled
to test the migration, or, at least, we won't be able to after #18980
is re-merged. But the docs are still ok.

Closes #19007
2016-06-22 14:43:12 -04:00
..
2016-06-17 14:31:03 -07:00
2016-05-27 06:03:35 -04:00