close #6432
issue #2053

including support for optimistic locking (#1313)

fixes #5758

return value would not be a valid array when json encoded after unlink().

fixes #6065

groovy is now always on in ES 1.3.0

fixes #5662

fixes #3381

feature is not reliable

fixes #5136

close #4505

fixes #4452, close #4452

fixes #4086

fixes #3587

[ci skip]

breaking changes.

so information about changed values is available in `afterSave`-event.

fixes #2892

allow extending only one class to add scopes, fixes #2146

TODO:

- [ ] adjust guide docs
- [ ] adjust README files of extensions
- [ ] finish work and fix test breaks

- refactored elasticsearch AR to make type and index available in
  instantiate(), issue #1313

fixes #2281

fixes #1993

now supports mapped primary key when _id is part of source with an
alias.

also filled framework CHANGELOG with relevant changes since alpha