* elastic/master: (36 commits)
  Add check for minimum required Docker version (elastic#36497)
  Minor search controller changes (elastic#36479)
  Add default methods to DocValueFormat (elastic#36480)
  Fix the mixed cluster REST test explain/11_basic_with_types.
  Modify `BigArrays` to take name of circuit breaker (elastic#36461)
  Move LoggedExec to minimumRuntime source set (elastic#36453)
  added 6.5.4 version
  Add test logging for elastic#35644
  Tests- added helper methods to ESRestTestCase for checking warnings (elastic#36443)
  SQL: move requests' parameters to requests JSON body (elastic#36149)
  [Zen2] Respect the no_master_block setting (elastic#36478)
  Require soft-deletes when access changes snapshot (elastic#36446)
  Switch more tests to zen2 (elastic#36367)
  [Painless] Add extensive tests for def to primitive casts (elastic#36455)
  Add setting to bypass Rollover action (elastic#36235)
  Try running CI against Zulu (elastic#36391)
  [DOCS] Reworked the shard allocation filtering info.  (elastic#36456)
  Log [initial_master_nodes] on formation failure (elastic#36466)
  converting ForbiddenPatternsTask to .java (elastic#36194)
  fixed typo
  ...

This commit contains a few minor changes to our search code:

- adjust the visibility of a couple of methods in our search code to package private from public or protected.
- make some of the `SearchPhaseController` methods static where possible
- rename one of the `SearchPhaseController#reducedQueryPhase` methods (used only for scroll requests) to `reducedScrollQueryPhase` without the `isScrollRequest` argument which was always set to `true`
- replace leniency in `SearchPhaseController#setShardIndex` with an assert to make sure that we never set the shard index twice
- remove two null checks where the checked field can never be null
- resolve an unchecked warning
- replace `List#toArray` invocation that creates an array providing the true size with array creation of length 0
- correct a couple of typos in comments

This commit contains a few minor changes to our search code:

- adjust the visibility of a couple of methods in our search code to package private from public or protected.
- make some of the `SearchPhaseController` methods static where possible
- rename one of the `SearchPhaseController#reducedQueryPhase` methods (used only for scroll requests) to `reducedScrollQueryPhase` without the `isScrollRequest` argument which was always set to `true`
- replace leniency in `SearchPhaseController#setShardIndex` with an assert to make sure that we never set the shard index twice
- remove two null checks where the checked field can never be null
- resolve an unchecked warning
- replace `List#toArray` invocation that creates an array providing the true size with array creation of length 0
- correct a couple of typos in comments