ElasticSearch v6.0.0-alpha1发布，分布式搜索引擎

ElasticSearch v6.0.0-alpha1 发布了，Elastic Search 是一个基于Lucene构建的开源，分布式，RESTful 搜索引擎。设计用于云计算中，能够达到实时搜索，稳定，可靠，快速，安装使用方便。支持通过 HTTP 使用 JSON 进行数据索引。该版本主要更新如下：

Allocation

• Remove cluster.routing.allocation.snapshot.relocation_enabled setting #20994

Analysis

• Removing query-string parameters in _analyze API #20704 (issue: #20246)

CAT API

• Write -1 on unbounded queue in cat thread pool #21342 (issue: #21187)

CRUD

• Disallow VersionType.FORCE for GetRequest #21079 (issue: #20995)

• Disallow VersionType.FORCE versioning for 6.x indices #20995 (issue: #20377)

Cluster

• No longer allow cluster name in data path #20433 (issue: #20391)

Core

• Simplify file store #24402 (issue: #24390)

• Make boolean conversion strict #22200

• Remove the default store type. #21616

• Remove store throttling. #21573

Geo

• Remove deprecated geo search features #22876

• Reduce GeoDistance Insanity #19846

Index APIs

• Open/Close index api to allow_no_indices by default #24401 (issues: #24031, #24341)

• Remove support for controversial ignore_unavailable and allow_no_indices from indices exists api #20712

Index Templates

• Allows multiple patterns to be specified for index templates #21009 (issue: #20690)

Java API

• Enforce Content-Type requirement on the rest layer and remove deprecated methods #23146 (issue: #19388)

Mapping

• Enforce at most one type. #24428 (issue: #24317)

• Disallow include_in_all for 6.0+ indices #22970 (issue: #22923)

• Disable _all by default, disallow configuring _all on 6.0+ indices #22144 (issues: #19784, #20925, #21341)

• Throw an exception on unrecognized "match_mapping_type" #22090 (issue: #17285)

Network

• Remove blocking TCP clients and servers #22639

• Remove modules/transport_netty_3 in favor of netty_4 #21590

• Remove LocalTransport in favor of MockTcpTransport #20695

Packaging

• Remove customization of ES_USER and ES_GROUP #23989 (issue: #23848)

Percolator

• Remove deprecated percolate and mpercolate apis #22331

Plugin Delete By Query

• Require explicit query in _delete_by_query API #23632 (issue: #23629)

Plugin Discovery EC2

• Ec2 Discovery: Cleanup deprecated settings #24150

• Discovery EC2: Remove region setting #23991 (issue: #22758)

• AWS Plugins: Remove signer type setting #23984 (issue: #22599)

Plugin Lang JS

• Remove lang-python and lang-javascript #20734 (issue: #20698)

Plugin Mapper Attachment

• Remove mapper attachments plugin #20416 (issue: #18837)

Plugin Repository Azure

• Remove global repositories.azure settings #23262 (issues: #22800, #22856)

• Remove auto creation of container for azure repository #22858 (issue: #22857)

Plugin Repository S3

• S3 Repository: Cleanup deprecated settings #24097

• S3 Repository: Remove region setting #22853 (issue: #22758)

• S3 Repository: Remove bucket auto create #22846 (issue: #22761)

• S3 Repository: Remove env var and sysprop credentials support #22842

Query DSL

• Remove deprecated minimum_number_should_match in BoolQueryBuilder #22416

• Remove support for empty queries #22092 (issue: #17624)

• Remove deprecated query names: in, geo_bbox, mlt, fuzzy_match and match_fuzzy #21852

• The terms query should always map to a Lucene TermsQuery. #21786

• Be strict when parsing values searching for booleans #21555 (issue: #21545)

• Remove collect payloads parameter #20385

REST

• Remove ldjson support and document ndjson for bulk/msearch #23049 (issue: #23025)

• Enable strict duplicate checks for all XContent types #22225 (issues: #19614, #22073)

• Enable strict duplicate checks for JSON content #22073 (issue: #19614)

• Remove lenient stats parsing #21417 (issues: #20722, #21410)

• Remove allow unquoted JSON #20388 (issues: #17674, #17801)

• Remove FORCE version_type #20377 (issue: #19769)

Scripting

• Make dates be ReadableDateTimes in scripts #22948 (issue: #22875)

• Remove groovy scripting language #21607

Search

• ProfileResult and CollectorResult should print machine readable timing information #22561

• Remove indices query #21837 (issue: #17710)

• Remove ignored type parameter in search_shards api #21688

Sequence IDs

• Change certain replica failures not to fail the replica shard #22874 (issue: #10708)

Shadow Replicas

• Remove shadow replicas #23906 (issue: #22024)

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