This loads an index template for the watch history to make sure,
that field changes are taken into account.
Also, the dynamic mapping for the watch history template has been
changed from strict to false.
This means that new fields can be included in a document, but they
will not indexed and are not searchable.
In addition the index names have been changed from .watch_history-$date to
.watcher-history-$template-$date - using dashes to be more consistent.
Closeselastic/elasticsearch#1299
Original commit: elastic/x-pack-elasticsearch@794f982234
Alexander Reelsen
Ryan Ernst
jaymode