Add missing license headers
Add a benchmark for BytesRef comparisons.
Fix license header og BytesRefComparisonsBenchmark.
Update Eclipse template to use the new license header.
Rename fuzziness/min_similarity to edit_distance

A lot of different API's currently use different names for the
same logical parameter. Since lucene moved away from the notion
of a `similarity` and now uses an `edit distance` we should generalize
this and encapsulate the generation, parsing and creation of these
settings across all queries.

This commit adds a new `EditDistance` class that handles the renaming
and generalization in a backwards compatible manner.

Closes #4082
Add ParseField to better support deprecated Query DSL parameters

The ParseField class allows specifying parameger that have been deprecated.
Those parameters can be more easily tracked and removed in future version.
This also allows to run queries in `strict` mode per index to throw
exceptions if a query is executed with deprected keys.
Remove deprecated methods and parameter names and update docs