Previously, queries on the _index field were not able to specify index aliases.
This was a regression in functionality compared to the 'indices' query that was
deprecated and removed in 6.0.

Now queries on _index can specify an alias, which is resolved to the concrete
index names when we check whether an index matches. To match a remote shard
target, the pattern needs to be of the form 'cluster:index' to match the
fully-qualified index name. Aliases can be specified in the following query
types: term, terms, prefix, and wildcard.

…aliases

…aliases

The functionality these tests target is now covered by IndexFieldTypeTests and
SearchIndexNameMatcherTests.

…aliases