Elasticsearch 自6.3版本以来的发布亮点_elasticsearch6.3特性

1.License管理和X-pack
自Elasticsearch6.3版本开始Elasticsearch集成X-pack，无须额外安装，自带basic license
 
2.ElasticSearch SQL
6.3版本为experimental 功能，
使用SQL访问Elasticsearch里的数据.
 
 
3.Rollup
6.3版本支持
 
4.对新版Java的支持：
Java9  6.2
Java10 6.3,6.4
Java11 6.5+
 
 
主要是对Java8的支持。
 
5.分析：
  multiplexing token filter
  对text 字段进行分析
 
6.mappings：
 
7. Rank Eval API：
 
8.search搜索：
 
9.Audit security events in new structured logs
Discover the structure of text files
Improved machine learning results for partitioned multi-metric jobs
Improved machine learning results for partitioned multi-metric jobs
Find multi-bucket anomalies in machine learning jobs
ODBC连接Elasticsearch SQL
6.5版本为Alpha
CCR
6.5为beta，6.7和7.0GA版本
monitor Elasticsearch with metricbeat
6.5为beta
apply token filters conditionally
delegate authorization to other realms：
create source-only snapshots
Index lifecycle management
6.6版本为beta版本，6.7和7.0版本GA
冷冻索引Frozen indices
 
BKD-backed geoshapes：
 
ELastic SQL:
6.7版本GA和7.0
TLS is now licensed under the Elastic Basic license
6.8和7.1版本
RBAC (Role Based Access Control) is now licenced under Elastic Basic license
6.8和7.1版本
Adaptive replica selection enabled by default
7.0版本
Skip shard refreshes if a shard is "search idle"
7.0
Default to one shard
7.0
Lucene 8
7.0
Introduce the ability to minimize round-trips in cross-cluster search
7.0
New cluster coordination implementation
7.0
Better support for small heaps (the real-memory circuit breaker)
7.0
 
High-level REST client is feature-complete
7.0
Support nanosecond timestamps
7.0
Faster retrieval of top hits
7.0
Support for TLS 1.3
7.0
Bundle JDK in Elasticsearch distribution
7.0
Rank features
7.0
JSON logging
7.0
Script score query (aka function score 2.0)
7.0

https://www.elastic.co/guide/en/elasticsearch/reference/6.8/release-highlights.html

https://www.elastic.co/guide/en/elasticsearch/reference/6.8/es-release-notes.html

https://www.elastic.co/guide/en/elasticsearch/reference/6.8/breaking-changes.html

https://www.elastic.co/guide/en/elasticsearch/reference/7.1/release-highlights.html

https://discuss.elastic.co/t/dec-22nd-2018-cn-elasticsearch-ccr/161626