Docs: Additional info about _score calculation

Description taken from http://www.elasticsearch.org/guide/en/elasticsearch/guide/current/multi-query-strings.html / 110_Multi_Field_Search/05_Multiple_query_strings.asciidoc

Closes #8635
MLT Query: Support for ignore docs

Adds a `ignore_like` parameter to the MLT Query, which simply tells the
algorithm to skip all the terms from the given documents. This could be useful
in order to better guide nearest neighbor search by telling the algorithm to
never explore the space spanned by the given `ignore_like` docs. In essence we
are interested about the characteristic of a given item, but not of the ones
provided by `ignore_like`, thereby forcing the algorithm to go deeper in its
selection of terms. Note that this is different than simply performing a must
not boolean query on the unliked items. The syntax is exactly the same as the
`like` parameter.

Closes #8674
[TEST] Relax constraints of breaker tests even more

They were very stringent, and add values in worst-case situations. The
new values are acceptable while still testing the functionality of the
breaker.
[TEST] Explicit wait for fielddata breaker to be cleared
Update daterange-aggregation.asciidoc

Clarified the date-math expressions on date range aggregations

Closes #8703
Logging - provides template usage information on index creation
Closes #7421