anchor.diff:  
   
   
  -[[regression-5.1.1]]
  -[float]
  -=== Regressions
  -
  -Highlighting::
  -* Handle SynonymQuery extraction for the FastVectorHighlighter {pull}20829[#20829] (issue: {issue}20781[#20781])
  -
  -Plugin Discovery EC2::
  -* Fix ec2 discovery when used with IAM profiles. {pull}21042[#21042] (issue: {issue}21039[#21039])
  -
  -Plugin Repository S3::
  -* Fix s3 repository when used with IAM profiles {pull}21058[#21058] (issue: {issue}21048[#21048])
  -
  -Plugins::
  -* Plugins: Add back user agent when downloading plugins {pull}20872[#20872]
  -
  -
  -
   [[upgrade-5.1.1]]
   [float]
   === Upgrades
  
positive.code: * Throw error if query element doesn't end with END_OBJECT {pull}20528[#20528] (issue: {issue}20515[#20515])
  * Remove `lowercase_expanded_terms` and `locale` from query-parser options. {pull}20208[#20208] (issue: {issue}9978[#9978])
  
  REST::
  * Add a REST spec for the create API {pull}20924[#20924]
  * Add response params to REST params did you mean {pull}20753[#20753] (issues: {issue}20722[#20722], {issue}20747[#20747])
  * Add did you mean to strict REST params {pull}20747[#20747] (issue: {issue}20722[#20722])
  
  Reindex API::
  * Add "simple match" support for reindex-from-remote whitelist {pull}21004[#21004]
  * Make reindex-from-remote ignore unknown fields {pull}20591[#20591] (issue: {issue}20504[#20504])
  
  Scripting::
  
negative.code: * Do not cache term queries. {pull}21566[#21566] (issues: {issue}16031[#16031], {issue}20116[#20116])
  * Parse alias filters on the coordinating node {pull}20916[#20916]
  
  Cluster::
  * Cache successful shard deletion checks {pull}21438[#21438]
  
  Core::
  * Reduce memory pressure when sending large terms queries. {pull}21776[#21776]
  