Search: better results for single terms

[stsewd]

This makes use of the wildcard query when a single term is given, users can still have exact results by using the "word" syntax. This is under a feature flag.

Examples, having indexed the following "foo", "foo.bar", "bar.foo" "network", "two".

• Searching for foo will return foo, foo.bar and bar.foo (before this it would return only foo)
• Searching for two will return two and network (here exact matches have more priority) (before this it would return only two)
• Searching for "two" will return two (same as before)

https://www.elastic.co/guide/en/elasticsearch/reference/current/query-dsl-wildcard-query.html

Based on #7568

[ericholscher]

Looks like an interesting thing to test out 👍

[stsewd]

Need to merge #7568 first