Also test the `fields` option.
FieldData Stats: Add field data stats to indices stats API
closes #2870
Node Stats: Allow to explicitly get specific indices level node stats element
closes #2871
release 0.90.0.RC2
move to 0.90.0.RC3 snap
Fix IndexMissingException in get template request

Fixes #2873
use enum to represent flags and fail if flags are not respected
ensure that modificatons to the enum order trigger test failures since we rely on the ordinal
Get template should return warmers

Fixes #2868