anchor.diff:  * Ignore obsolete dangling indices {pull}37824[#37824] (issue: {issue}27073[#27073])
   * ALLOC: Fail Stale Primary Alloc. Req. without Data {pull}37226[#37226] (issue: {issue}37098[#37098])
   
  +Analysis::
  +* Fix PreConfiguredTokenFilters getSynonymFilter() implementations {pull}38858[#38858] (issues: {issue}38793[#38793], {issue}38839[#38839])
  +* Fix PreConfiguredTokenFilters getSynonymFilter() implementations {pull}38839[#38839] (issue: {issue}38793[#38793])
  +
   Audit::
   * Fix IndexAuditTrail rolling upgrade on rollover edge - take 2 {pull}38286[#38286] (issues: {issue}33867[#33867], {issue}35988[#35988], {issue}37062[#37062])
   * Fix NPE in Logfile Audit Filter {pull}38120[#38120] (issue: {issue}38097[#38097])
   
   Authentication::
  +* Use consistent view of realms for authentication {pull}38815[#38815] (issue: {issue}30301[#30301])
   *  Enhance parsing of StatusCode in SAML Responses {pull}38628[#38628]
   * Limit token expiry to 1 hour maximum {pull}38244[#38244]
   * Fix expired token message in Exception header {pull}37196[#37196]
   * Fix NPE in CachingUsernamePasswordRealm {pull}36953[#36953] (issue: {issue}36951[#36951])
   
   CCR::
  +* Fix shard follow task startup error handling {pull}39053[#39053] (issue: {issue}38779[#38779])
  +* Filter out upgraded version index settings when starting index following {pull}38838[#38838] (issue: {issue}38835[#38835])
  +* Handle the fact that `ShardStats` instance may have no commit or seqno stats {pull}38782[#38782] (issue: {issue}38779[#38779])
  +* Fix LocalIndexFollowingIT#testRemoveRemoteConnection() test {pull}38709[#38709] (issue: {issue}38695[#38695])
   * Prevent CCR recovery from missing documents {pull}38237[#38237]
   * Fix file reading in ccr restore service {pull}38117[#38117]
   * Correct argument names in update mapping/settings from leader {pull}38063[#38063]
  
positive.code: * Handle malformed license signatures {pull}37137[#37137] (issue: {issue}35340[#35340])
  
  Machine Learning::
  * Move ML Optimistic Concurrency Control to Seq No {pull}38278[#38278] (issues: {issue}10708[#10708], {issue}36148[#36148])
  * [ML] Add explanation so far to file structure finder exceptions {pull}38191[#38191] (issue: {issue}29821[#29821])
  * ML: Add upgrade mode docs, hlrc, and fix bug {pull}37942[#37942]
  
negative.code: * SQL: Enhance Verifier to prevent aggregate or grouping functions from {pull}36799[#36799] (issue: {issue}36798[#36798])
  
  Search::
  * Fix simple query string serialization conditional {pull}38960[#38960] (issues: {issue}21504[#21504], {issue}38889[#38889])
  * Ensure that maxConcurrentShardRequests is never defaulted to 0 {pull}38734[#38734]
  * Look up connection using the right cluster alias when releasing contexts {pull}38570[#38570]
  * Fix fetch source option in expand search phase {pull}37908[#37908] (issue: {issue}23829[#23829])
  * Throw if two inner_hits have the same name {pull}37645[#37645] (issue: {issue}37584[#37584])
  * Ensure either success or failure path for SearchOperationListener is called {pull}37467[#37467] (issue: {issue}37185[#37185])
  