New features:

• Running Elasticsearch as a service on Windows #3716

Enhancements:

• Add node.mode with local or network #3713
• Better handling of /_all/_search when no indices exist #3710
• FlushNotAllowedEngineException during optimize #3631

Bug fixes:

• Elasticsearch startup script doesn't work from directory with spaces in path #3712
• NestedFieldComparator misses to copy slot if root doc has docID==0 and Avg is used #3706
• Alias filter not applied when using multi-index syntax with wild card in URL #3677
• Plugins: Automatic detection of site plugins fails to copy over the content to _site #3707