在Windows下elasticsearch启动失败，报${ES_TMPDIR}找不到问题。
【日志】
[2018-03-25T16:11:34,144][WARN ][o.e.b.Natives ] unable to load JNA native support library, native methods will be disabled.
java.lang.UnsatisfiedLinkError: Failed to create temporary file for /com/sun/jna/win32-x86-64/jnidispatch.dll library: JNA temporary directory '${ES_TMPDIR}' does not exist
at com.sun.jna.Native.loadNativeDispatchLibraryFromClasspath(Native.java:962) ~[jna-4.5.1.jar:4.5.1 (b0)]
at com.sun.jna.Native.loadNativeDispatchLibrary(Native.java:922) ~[jna-4.5.1.jar:4.5.1 (b0)]
at com.sun.jna.Native.<clinit>(Native.java:190) ~[jna-4.5.1.jar:4.5.1 (b0)]
at java.lang.Class.forName0(Native Method) ~[?:1.8.0_60]
at java.lang.Class.forName(Class.java:264) ~[?:1.8.0_60]
at org.elasticsearch.bootstrap.Natives.<clinit>(Natives.java:45) [elasticsearch-6.2.2.jar:6.2.2]
at org.elasticsearch.bootstrap.Bootstrap.initializeNatives(Bootstrap.java:104) [elasticsearch-6.2.2.jar:6.2.2]
at org.elasticsearch.bootstrap.Bootstrap.setup(Bootstrap.java:172) [elasticsearch-6.2.2.jar:6.2.2]
at org.elasticsearch.bootstrap.Bootstrap.init(Bootstrap.java:323) [elasticsearch-6.2.2.jar:6.2.2]
at org.elasticsearch.bootstrap.Elasticsearch.init(Elasticsearch.java:121) [elasticsearch-6.2.2.jar:6.2.2]
at org.elasticsearch.bootstrap.Elasticsearch.execute(Elasticsearch.java:112) [elasticsearch-6.2.2.jar:6.2.2]
at org.elasticsearch.cli.EnvironmentAwareCommand.execute(EnvironmentAwareCommand.java:86) [elasticsearch-6.2.2.jar:6.2.2]
at org.elasticsearch.cli.Command.mainWithoutErrorHandling(Command.java:124) [elasticsearch-cli-6.2.2.jar:6.2.2]
at org.elasticsearch.cli.Command.main(Command.java:90) [elasticsearch-cli-6.2.2.jar:6.2.2]
at org.elasticsearch.bootstrap.Elasticsearch.main(Elasticsearch.java:92) [elasticsearch-6.2.2.jar:6.2.2]
at org.elasticsearch.bootstrap.Elasticsearch.main(Elasticsearch.java:85) [elasticsearch-6.2.2.jar:6.2.2]
[2018-03-25T16:14:33,946][WARN ][o.e.b.ElasticsearchUncaughtExceptionHandler] [CHANSON-PC] uncaught exception in thread [main]
org.elasticsearch.bootstrap.StartupException: java.lang.IllegalStateException: Unable to access 'java.io.tmpdir' (${ES_TMPDIR})
at org.elasticsearch.bootstrap.Elasticsearch.init(Elasticsearch.java:125) ~[elasticsearch-6.2.2.jar:6.2.2]
at org.elasticsearch.bootstrap.Elasticsearch.execute(Elasticsearch.java:112) ~[elasticsearch-6.2.2.jar:6.2.2]
at org.elasticsearch.cli.EnvironmentAwareCommand.execute(EnvironmentAwareCommand.java:86) ~[elasticsearch-6.2.2.jar:6.2.2]
at org.elasticsearch.cli.Command.mainWithoutErrorHandling(Command.java:124) ~[elasticsearch-cli-6.2.2.jar:6.2.2]
at org.elasticsearch.cli.Command.main(Command.java:90) ~[elasticsearch-cli-6.2.2.jar:6.2.2]
at org.elasticsearch.bootstrap.Elasticsearch.main(Elasticsearch.java:92) ~[elasticsearch-6.2.2.jar:6.2.2]
at org.elasticsearch.bootstrap.Elasticsearch.main(Elasticsearch.java:85) ~[elasticsearch-6.2.2.jar:6.2.2]
Caused by: java.lang.IllegalStateException: Unable to access 'java.io.tmpdir' (${ES_TMPDIR})
at org.elasticsearch.bootstrap.FilePermissionUtils.addDirectoryPath(FilePermissionUtils.java:70) ~[elasticsearch-6.2.2.jar:6.2.2]
at org.elasticsearch.bootstrap.Security.addFilePermissions(Security.java:299) ~[elasticsearch-6.2.2.jar:6.2.2]
at org.elasticsearch.bootstrap.Security.createPermissions(Security.java:262) ~[elasticsearch-6.2.2.jar:6.2.2]
at org.elasticsearch.bootstrap.Security.configure(Security.java:123) ~[elasticsearch-6.2.2.jar:6.2.2]
at org.elasticsearch.bootstrap.Bootstrap.setup(Bootstrap.java:208) ~[elasticsearch-6.2.2.jar:6.2.2]
at org.elasticsearch.bootstrap.Bootstrap.init(Bootstrap.java:323) ~[elasticsearch-6.2.2.jar:6.2.2]
at org.elasticsearch.bootstrap.Elasticsearch.init(Elasticsearch.java:121) ~[elasticsearch-6.2.2.jar:6.2.2]
... 6 more
Caused by: java.nio.file.AccessDeniedException: C:\Program Files\Elastic\Elasticsearch\6.2.2\bin\${ES_TMPDIR}
at sun.nio.fs.WindowsException.translateToIOException(WindowsException.java:83) ~[?:1.8.0_60]
at sun.nio.fs.WindowsException.rethrowAsIOException(WindowsException.java:97) ~[?:1.8.0_60]
【分析】
这是由于权限导致的。
【解决方案】
到elastic目录，例如：C:\Program Files\Elastic\Elasticsearch\6.2.2\bin，右键”elasticsearch.exe”，选择“以管理员身份运行”，即可。