一、elasticsearch启动报错

[root@localhost init.d]# Exception in thread "main" org.elasticsearch.bootstrap.BootstrapException: java.nio.file.FileAlreadyExistsException: /data/elk/elasticsearch-7.5.1/config/elasticsearch.keystore.tmp
Likely root cause: java.nio.file.FileAlreadyExistsException: /data/elk/elasticsearch-7.5.1/config/elasticsearch.keystore.tmp
        at sun.nio.fs.UnixException.translateToIOException(UnixException.java:88)
        at sun.nio.fs.UnixException.rethrowAsIOException(UnixException.java:102)
        at sun.nio.fs.UnixException.rethrowAsIOException(UnixException.java:107)
        at sun.nio.fs.UnixFileSystemProvider.newByteChannel(UnixFileSystemProvider.java:214)
        at java.nio.file.spi.FileSystemProvider.newOutputStream(FileSystemProvider.java:434)
        at java.nio.file.Files.newOutputStream(Files.java:216)
        at org.apache.lucene.store.FSDirectory$FSIndexOutput.<init>(FSDirectory.java:410)
        at org.apache.lucene.store.FSDirectory$FSIndexOutput.<init>(FSDirectory.java:406)
        at org.apache.lucene.store.FSDirectory.createOutput(FSDirectory.java:254)
        at org.elasticsearch.common.settings.KeyStoreWrapper.save(KeyStoreWrapper.java:484)
        at org.elasticsearch.bootstrap.Bootstrap.loadSecureSettings(Bootstrap.java:242)
        at org.elasticsearch.bootstrap.Bootstrap.init(Bootstrap.java:305)
        at org.elasticsearch.bootstrap.Elasticsearch.init(Elasticsearch.java:159)
        at org.elasticsearch.bootstrap.Elasticsearch.execute(Elasticsearch.java:150)
        at org.elasticsearch.cli.EnvironmentAwareCommand.execute(EnvironmentAwareCommand.java:86)
        at org.elasticsearch.cli.Command.mainWithoutErrorHandling(Command.java:125)
        at org.elasticsearch.cli.Command.main(Command.java:90)
        at org.elasticsearch.bootstrap.Elasticsearch.main(Elasticsearch.java:115)
        at org.elasticsearch.bootstrap.Elasticsearch.main(Elasticsearch.java:92)
Refer to the log for complete error details.

二、解决办法

找到 elasticsearch.keystore.tmp 删除即可