下载ES

https://www.elastic.co/cn/downloads/elasticsearch

启动es

在bin目录下找到elasticsearch.bat，双击启动。

打开浏览器，输入http://localhost:9200

安装为Windows服务

elasticsearch-service.bat install

elasticsearch-service.bat后面还可以执行这些命令
install: 安装Elasticsearch服务
remove: 删除已安装的Elasticsearch服务（如果启动则停止服务）
start: 启动Elasticsearch服务（如果已安装）
stop: 停止服务（如果启动）
manager:启动GUI来管理已安装的服务

问题

根据百度走到这一步就出问题了！！！！！！！！！！！！！！注册为服务后，一直启动失败！

通过cmd启动也是一样

服务启动日志如下：

[2020-06-03 14:05:12] [info]  [ 7584] Commons Daemon procrun (1.1.0.0 64-bit) started
[2020-06-03 14:05:12] [info]  [ 7584] Starting service 'elasticsearch-service-x64' ...
[2020-06-03 14:05:31] [info]  [ 8008] Commons Daemon procrun (1.1.0.0 64-bit) started
[2020-06-03 14:05:31] [info]  [ 8008] Running 'elasticsearch-service-x64' Service...
[2020-06-03 14:05:31] [info]  [ 7032] Starting service...
[2020-06-03 14:05:33] [error] [ 7584] apxServiceControl(): dwState(4) != dwCurrentState(1); dwWin32ExitCode = 1067, dwWaitHint = 0, dwServiceSpecificExitCode = 0
[2020-06-03 14:05:33] [error] [ 7584] apxServiceControl(): returning FALSE
[2020-06-03 14:05:34] [error] [ 7584] Failed to start service 'elasticsearch-service-x64'
[2020-06-03 14:05:34] [info]  [ 7584] Start service finished, returning 0
[2020-06-03 14:05:34] [error] [ 7584] Commons Daemon procrun failed with exit value: 5 (Failed to start service)

作为新手是真的看不懂什么原因，去度娘，QQ群和社区里也没能找到原因，后来在错误日志中发现如下报错：

以为是环境变量的问题，百度了下发现也没说es安装需要配置环境变量，但还是根据提示配置了下，也还是不行。

看了官方给的文档中，打开服务管理查看配置，好像也没什么好改的，也没有报错中的es_path_conf项。

把日志级别设置为debug，再次启动服务看看日志情况。

[2020-06-03 14:23:26] [debug] ( prunsrv.c:1729) [14816] Commons Daemon procrun log initialized
[2020-06-03 14:23:26] [info]  ( prunsrv.c:1733) [14816] Commons Daemon procrun (1.1.0.0 64-bit) started
[2020-06-03 14:23:26] [info]  ( prunsrv.c:766 ) [14816] Starting service 'elasticsearch-service-x64' ...
[2020-06-03 14:23:44] [debug] ( prunsrv.c:1729) [13640] Commons Daemon procrun log initialized
[2020-06-03 14:23:44] [info]  ( prunsrv.c:1733) [13640] Commons Daemon procrun (1.1.0.0 64-bit) started
[2020-06-03 14:23:45] [info]  ( prunsrv.c:1643) [13640] Running 'elasticsearch-service-x64' Service...
[2020-06-03 14:23:45] [debug] ( prunsrv.c:1417) [12200] Inside ServiceMain...
[2020-06-03 14:23:45] [debug] ( prunsrv.c:885 ) [12200] reportServiceStatusE: dwCurrentState = 2, dwWin32ExitCode = 0, dwWaitHint = 3000, dwServiceSpecificExitCode = 0
[2020-06-03 14:23:45] [info]  ( prunsrv.c:1175) [12200] Starting service...
[2020-06-03 14:23:45] [debug] ( javajni.c:236 ) [12200] loading jvm 'C:\Program Files\Java\jdk1.8.0_102\jre\bin\server\jvm.dll'
[2020-06-03 14:23:45] [debug] ( javajni.c:753 ) [  480] Jvm Option[0] -Des.networkaddress.cache.ttl=60
[2020-06-03 14:23:45] [debug] ( javajni.c:753 ) [  480] Jvm Option[1] -Des.networkaddress.cache.negative.ttl=10
[2020-06-03 14:23:45] [debug] ( javajni.c:753 ) [  480] Jvm Option[2] -XX:+AlwaysPreTouch
[2020-06-03 14:23:45] [debug] ( javajni.c:753 ) [  480] Jvm Option[3] -Djava.awt.headless=true
[2020-06-03 14:23:45] [debug] ( javajni.c:753 ) [  480] Jvm Option[4] -Dfile.encoding=UTF-8
[2020-06-03 14:23:45] [debug] ( javajni.c:753 ) [  480] Jvm Option[5] -Djna.nosys=true
[2020-06-03 14:23:45] [debug] ( javajni.c:753 ) [  480] Jvm Option[6] -XX:-OmitStackTraceInFastThrow
[2020-06-03 14:23:45] [debug] ( javajni.c:753 ) [  480] Jvm Option[7] -Djava.class.path=C:\es\elasticsearch-7.7.0-windows-x86_64\elasticsearch-7.7.0\lib\elasticsearch-7.7.0.jar;C:\es\elasticsearch-7.7.0-windows-x86_64\elasticsearch-7.7.0\lib\elasticsearch-cli-7.7.0.jar;C:\es\elasticsearch-7.7.0-windows-x86_64\elasticsearch-7.7.0\lib\elasticsearch-core-7.7.0.jar;C:\es\elasticsearch-7.7.0-windows-x86_64\elasticsearch-7.7.0\lib\elasticsearch-geo-7.7.0.jar;C:\es\elasticsearch-7.7.0-windows-x86_64\elasticsearch-7.7.0\lib\elasticsearch-launchers-7.7.0.jar;C:\es\elasticsearch-7.7.0-windows-x86_64\elasticsearch-7.7.0\lib\elasticsearch-plugin-classloader-7.7.0.jar;C:\es\elasticsearch-7.7.0-windows-x86_64\elasticsearch-7.7.0\lib\elasticsearch-secure-sm-7.7.0.jar;C:\es\elasticsearch-7.7.0-windows-x86_64\elasticsearch-7.7.0\lib\elasticsearch-x-content-7.7.0.jar;C:\es\elasticsearch-7.7.0-windows-x86_64\elasticsearch-7.7.0\lib\HdrHistogram-2.1.9.jar;C:\es\elasticsearch-7.7.0-windows-x86_64\elasticsearch-7.7.0\lib\hppc-0.8.1.jar;C:\es\elasticsearch-7.7.0-windows-x86_64\elasticse
[2020-06-03 14:23:45] [debug] ( javajni.c:753 ) [  480] Jvm Option[8] exit
[2020-06-03 14:23:45] [debug] ( javajni.c:753 ) [  480] Jvm Option[9] abort
[2020-06-03 14:23:45] [debug] ( javajni.c:753 ) [  480] Jvm Option[10] -Xms1024m
[2020-06-03 14:23:45] [debug] ( javajni.c:753 ) [  480] Jvm Option[11] -Xmx1024m
[2020-06-03 14:23:45] [debug] ( javajni.c:753 ) [  480] Jvm Option[12] -Xss1024k
[2020-06-03 14:23:45] [debug] ( javajni.c:937 ) [  480] argv[0] = --quiet
[2020-06-03 14:23:45] [debug] ( javajni.c:990 ) [  480] Java Worker thread started org/elasticsearch/bootstrap/Elasticsearch:main
[2020-06-03 14:23:46] [debug] ( javajni.c:504 ) [ 9524] Exit hook with exit code 78
[2020-06-03 14:23:46] [debug] ( prunsrv.c:960 ) [ 9524] Start exit hook called ...
[2020-06-03 14:23:46] [debug] ( prunsrv.c:961 ) [ 9524] VM exit code: 78
[2020-06-03 14:23:46] [debug] ( service.c:507 ) [14816] apxServiceControl(): Sleeping 1000 milliseconds
[2020-06-03 14:23:47] [debug] ( service.c:511 ) [14816] apxServiceControl(): QueryServiceStatus OK
[2020-06-03 14:23:47] [error] ( service.c:520 ) [14816] apxServiceControl(): dwState(4) != dwCurrentState(1); dwWin32ExitCode = 1067, dwWaitHint = 0, dwServiceSpecificExitCode = 0
[2020-06-03 14:23:47] [error] ( service.c:534 ) [14816] apxServiceControl(): returning FALSE
[2020-06-03 14:23:47] [error] ( prunsrv.c:787 ) [14816] Failed to start service 'elasticsearch-service-x64'
[2020-06-03 14:23:47] [info]  ( prunsrv.c:795 ) [14816] Start service finished, returning 0
[2020-06-03 14:23:47] [error] ( prunsrv.c:1805) [14816] Commons Daemon procrun failed with exit value: 5 (Failed to start service)

差点从入门到放弃！最后还是决定再试试，这次跟着官方给的文档走。
https://www.elastic.co/guide/en/elasticsearch/reference/7.7/index.html

发现了更奇葩的问题，我从新下了一个安装包，解压后没有修改任何配置，直接安装服务并启动，出现如下：

安装完成后第一次启动居然成功了，然后我stop服务再次启动，之后的就全都失败了！！！在公司电脑（win7、windows server 2008、windows server 2012）上都是一样，我开始怀疑是JDK的问题，因为我本身就是JAVA开发，个人电脑和公司两台windows测试服务器都装过JAVA开发环境，所以我找了一台没有JDK环境的电脑，结果一切都非常顺利…WHY！！！

安装服务时显示用的是es自带的jdk，后面重启服务也都没有出错！那么问题又来了，难道用系统自带的JDK就不行吗？！

大概意思就是要使用自己的Java版本，请设置JAVA_HOME环境变量。如果必须使用与捆绑的JVM不同的Java版本，则建议使用受支持的Java LTS版本。如果使用已知的Java错误版本，Elasticsearch将拒绝启动。
我电脑上装的是jdk8，他捆绑的是jdk11不知道是不是这个原因！难道需要更改服务器上的JAVA环境？？升级服务器上的JDK版本…感觉风险好大啊，好多项目跑着呢！晕！！！