Bug fixes

• Aggregations:
  • Fix date_histogram issues during a timezone DST switch #8655 (issue: #8339)
  • Fix geohash grid doc counts computation on multi-valued fields #8574 (issue: #8512)
  • Parser throws NullPointerException when Filter aggregation clause is empty #8527 (issue: #8438)
  • size property parsing inconsistent #6061
• Bulk API:
  • Missing parent routing causes NullPointerException #8506 (issue: #8365)
• Core:
  • Remove unnecessary index removal on index creation #8639
  • SerialMergeScheduler never triggers index throttling #8405
• DateMath:
  • Fix semantics of rounding with inclusive/exclusive ranges. #8556 (issue: #8424)
• Fix:
  • If dangling_timeout was set to 0 and auto_import_dangled #8257
• Geo:
  • Fix for geohash neighbors when geohash length is even. #8529 (issue: #8526)
  • Fix for ArithmeticException[/ by zero] when parsing a polygon #8475 (issue: #8433)
• Internal:
  • Don't pass acceptdocs down to nonNestedDocsFilter in ParentsFilter #8463 (issue: #8461)
  • harden recovery for old segments #8399
  • Don't pass acceptdocs down to parents filter. #8390 (issue: #8389)
• Parent/child:
  • Fixed p/c filters not being able to be used in alias filters. #8649 (issues: #5916, #8628)
• Query DSL:
  • Fix wrong error messages in MultiMatchQueryParser #8597
  • Resolve now in date ranges in percolator and alias filters at search time instead of parse time #8534 (issue: #8474)
• Settings:
  • Tab characters in YAML should throw an exception #8355 (issue: #8259)
• Snapshot/Restore:
  • restore with wait_for_completion=true should wait for succesfully restored shards to get started #8545 (issue: #8340)
  • keep the last legacy checksums file at the end of rest... #8358 (issue: #8119)
• Stats:
  • Fix Bloom filter ram usage calculation #8584 (issue: #8564)
• Store:
  • Calculate Alder32 Checksums for legacy files in Store#checkIntegrity #8407