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我用的最新版本Elasticsearch 7.4,下图是官网的介绍，说解压包里已经有最合适的jdk包了，我们只需要修改指向，让它启动时用这个包就行了，网上搜出了好多文章是修改"bin/elasticsearch",可能是因为他们是linux系统，我是用的windows系统，没生效，看了下修改了另一个文件"bin/elasticsearch-env.bat"文件,成功启动。
修改bin/elasticsearch-env.bat
改变下面这一块的语义就行了
我是修改了JAVA_HOME的值，直接增加了下面一句话
rem 配置自己的jdk
set JAVA_HOME=F:/elasticsearch/elasticsearch-7.3.0/jdklinux系统也可以用这个方法，找到 elasticsearch-env 这个文件
大概在39 - 40 行 将JAVA_HOME换成刚刚配置的ES_JDK
启动ES
到这里我们又看到另一个警告
OpenJDK 64-Bit Server VM warning: Option UseConcMarkSweepGC was deprecated in version 9.0 and will likely be removed in a future release.
这是提醒你 cms 垃圾收集器在 jdk9 就开始被标注为 @deprecated
看下JDK11支持的垃圾回收器
HotSpot Virtual Machine Garbage Collection Tuning Guide
修改config/jvm.options
#将 ： -XX:+UseConcMarkSweepGC
#改为：-XX:+UseG1GC
完整配置如下
## JVM configuration################################################################
## IMPORTANT: JVM heap size
################################################################
##
## You should always set the min and max JVM heap
## size to the same value. For example, to set
## the heap to 4 GB, set:
##
## -Xms4g
## -Xmx4g
##
## See https://www.elastic.co/guide/en/elasticsearch/reference/current/heap-size.html
## for more information
##
################################################################# Xms represents the initial size of total heap space
# Xmx represents the maximum size of total heap space-Xms1g
-Xmx1g################################################################
## Expert settings
################################################################
##
## All settings below this section are considered
## expert settings. Don't tamper with them unless
## you understand what you are doing
##
################################################################
#修改jvm.options
#将 ： -XX:+UseConcMarkSweepGC
#改为：-XX:+UseG1GC
## GC configuration
-XX:+UseG1GC
-XX:CMSInitiatingOccupancyFraction=75
-XX:+UseCMSInitiatingOccupancyOnly## G1GC Configuration
# NOTE: G1GC is only supported on JDK version 10 or later.
# To use G1GC uncomment the lines below.
# 10-:-XX:-UseConcMarkSweepGC
# 10-:-XX:-UseCMSInitiatingOccupancyOnly
# 10-:-XX:+UseG1GC
# 10-:-XX:InitiatingHeapOccupancyPercent=75## DNS cache policy
# cache ttl in seconds for positive DNS lookups noting that this overrides the
# JDK security property networkaddress.cache.ttl; set to -1 to cache forever
-Des.networkaddress.cache.ttl=60
# cache ttl in seconds for negative DNS lookups noting that this overrides the
# JDK security property networkaddress.cache.negative ttl; set to -1 to cache
# forever
-Des.networkaddress.cache.negative.ttl=10## optimizations# pre-touch memory pages used by the JVM during initialization
-XX:+AlwaysPreTouch## basic# explicitly set the stack size
-Xss1m# set to headless, just in case
-Djava.awt.headless=true# ensure UTF-8 encoding by default (e.g. filenames)
-Dfile.encoding=UTF-8# use our provided JNA always versus the system one
-Djna.nosys=true# turn off a JDK optimization that throws away stack traces for common
# exceptions because stack traces are important for debugging
-XX:-OmitStackTraceInFastThrow# flags to configure Netty
-Dio.netty.noUnsafe=true
-Dio.netty.noKeySetOptimization=true
-Dio.netty.recycler.maxCapacityPerThread=0# log4j 2
-Dlog4j.shutdownHookEnabled=false
-Dlog4j2.disable.jmx=true-Djava.io.tmpdir=${ES_TMPDIR}## heap dumps# generate a heap dump when an allocation from the Java heap fails
# heap dumps are created in the working directory of the JVM
-XX:+HeapDumpOnOutOfMemoryError# specify an alternative path for heap dumps; ensure the directory exists and
# has sufficient space
-XX:HeapDumpPath=data# specify an alternative path for JVM fatal error logs
-XX:ErrorFile=logs/hs_err_pid%p.log## JDK 8 GC logging8:-XX:+PrintGCDetails
8:-XX:+PrintGCDateStamps
8:-XX:+PrintTenuringDistribution
8:-XX:+PrintGCApplicationStoppedTime
8:-Xloggc:logs/gc.log
8:-XX:+UseGCLogFileRotation
8:-XX:NumberOfGCLogFiles=32
8:-XX:GCLogFileSize=64m# JDK 9+ GC logging
9-:-Xlog:gc*,gc+age=trace,safepoint:file=logs/gc.log:utctime,pid,tags:filecount=32,filesize=64m
# due to internationalization enhancements in JDK 9 Elasticsearch need to set the provider to COMPAT otherwise
# time/date parsing will break in an incompatible way for some date patterns and locals
9-:-Djava.locale.providers=COMPAT
保存重新启动
[2019-08-02T15:58:33,923][INFO ][o.e.e.NodeEnvironment ] [node-1] using [1] data paths, mounts [[/ (rootfs)]], net usable_space [32.6gb], net total_space [35.7gb], types [rootfs]
[2019-08-02T15:58:33,951][INFO ][o.e.e.NodeEnvironment ] [node-1] heap size [1gb], compressed ordinary object pointers [true]
[2019-08-02T15:58:33,953][INFO ][o.e.n.Node ] [node-1] node name [node-1], node ID [8zGCWQhBS3OpVShqjSgU-w], cluster name [es-application]
[2019-08-02T15:58:33,953][INFO ][o.e.n.Node ] [node-1] version[7.2.0], pid[1700], build[default/tar/508c38a/2019-06-20T15:54:18.811730Z], OS[Linux/3.10.0-862.el7.x86_64/amd64], JVM[Oracle Corporation/OpenJDK 64-Bit Server VM/11.0.1/11.0.1+13]
[2019-08-02T15:58:33,954][INFO ][o.e.n.Node ] [node-1] JVM home [/opt/jdk-11.0.1]
[2019-08-02T15:58:33,954][INFO ][o.e.n.Node ] [node-1] JVM arguments [-Xms1g, -Xmx1g, -XX:+UseG1GC, -XX:CMSInitiatingOccupancyFraction=75, -XX:+UseCMSInitiatingOccupancyOnly, -Des.networkaddress.cache.ttl=60, -Des.networkaddress.cache.negative.ttl=10, -XX:+AlwaysPreTouch, -Xss1m, -Djava.awt.headless=true, -Dfile.encoding=UTF-8, -Djna.nosys=true, -XX:-OmitStackTraceInFastThrow, -Dio.netty.noUnsafe=true, -Dio.netty.noKeySetOptimization=true, -Dio.netty.recycler.maxCapacityPerThread=0, -Dlog4j.shutdownHookEnabled=false, -Dlog4j2.disable.jmx=true, -Djava.io.tmpdir=/tmp/elasticsearch-15008659954472371205, -XX:+HeapDumpOnOutOfMemoryError, -XX:HeapDumpPath=data, -XX:ErrorFile=logs/hs_err_pid%p.log, -Xlog:gc*,gc+age=trace,safepoint:file=logs/gc.log:utctime,pid,tags:filecount=32,filesize=64m, -Djava.locale.providers=COMPAT, -Dio.netty.allocator.type=unpooled, -XX:MaxDirectMemorySize=536870912, -Des.path.home=/usr/local/src/elasticsearch, -Des.path.conf=/usr/local/src/elasticsearch/config, -Des.distribution.flavor=default, -Des.distribution.type=tar, -Des.bundled_jdk=true]
警告消失了
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