Error at starting Elasticsearch: StartupException - Unable to initialize modules

Elastic Stack Elasticsearch
1

Hello,

my 30 days trial of X-Pack has ended and I tried updating it to Basic License. I have registered and downloaded the license and tried updating it through the license API like it is said in the Docs. There was some error (unfortunately I did not save it) so I tried stopping elasticsearch cluster and starting it again. Since then my cluster won't start again. When I run it I receive the following error and it immediately shuts down. I have no idea what this error is about and if it has something to do with the license or is it something completely random. Please help.

[2017-09-04T11:05:10,101][WARN ][o.e.b.ElasticsearchUncaughtExceptionHandler] [] uncaught exception in thread [main]
org.elasticsearch.bootstrap.StartupException: java.lang.IllegalStateException: Unable to initialize modules
	at org.elasticsearch.bootstrap.Elasticsearch.init(Elasticsearch.java:127) ~[elasticsearch-5.5.1.jar:5.5.1]
	at org.elasticsearch.bootstrap.Elasticsearch.execute(Elasticsearch.java:114) ~[elasticsearch-5.5.1.jar:5.5.1]
	at org.elasticsearch.cli.EnvironmentAwareCommand.execute(EnvironmentAwareCommand.java:67) ~[elasticsearch-5.5.1.jar:5.5.1]
	at org.elasticsearch.cli.Command.mainWithoutErrorHandling(Command.java:122) ~[elasticsearch-5.5.1.jar:5.5.1]
	at org.elasticsearch.cli.Command.main(Command.java:88) ~[elasticsearch-5.5.1.jar:5.5.1]
	at org.elasticsearch.bootstrap.Elasticsearch.main(Elasticsearch.java:91) ~[elasticsearch-5.5.1.jar:5.5.1]
	at org.elasticsearch.bootstrap.Elasticsearch.main(Elasticsearch.java:84) ~[elasticsearch-5.5.1.jar:5.5.1]
Caused by: java.lang.IllegalStateException: Unable to initialize modules
	at org.elasticsearch.plugins.PluginsService.<init>(PluginsService.java:123) ~[elasticsearch-5.5.1.jar:5.5.1]
	at org.elasticsearch.node.Node.<init>(Node.java:312) ~[elasticsearch-5.5.1.jar:5.5.1]
	at org.elasticsearch.node.Node.<init>(Node.java:244) ~[elasticsearch-5.5.1.jar:5.5.1]
	at org.elasticsearch.bootstrap.Bootstrap$5.<init>(Bootstrap.java:232) ~[elasticsearch-5.5.1.jar:5.5.1]
	at org.elasticsearch.bootstrap.Bootstrap.setup(Bootstrap.java:232) ~[elasticsearch-5.5.1.jar:5.5.1]
	at org.elasticsearch.bootstrap.Bootstrap.init(Bootstrap.java:351) ~[elasticsearch-5.5.1.jar:5.5.1]
	at org.elasticsearch.bootstrap.Elasticsearch.init(Elasticsearch.java:123) ~[elasticsearch-5.5.1.jar:5.5.1]
	... 6 more
Caused by: java.nio.file.FileSystemException: /Users/Bre/Documents/es/elasticsearch-5.5.1/modules/.DS_Store/plugin-descriptor.properties: Not a directory
	at sun.nio.fs.UnixException.translateToIOException(UnixException.java:91) ~[?:?]
	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.Files.newByteChannel(Files.java:361) ~[?:1.8.0_121]
	at java.nio.file.Files.newByteChannel(Files.java:407) ~[?:1.8.0_121]
	at java.nio.file.spi.FileSystemProvider.newInputStream(FileSystemProvider.java:384) ~[?:1.8.0_121]
	at java.nio.file.Files.newInputStream(Files.java:152) ~[?:1.8.0_121]
	at org.elasticsearch.plugins.PluginInfo.readFromProperties(PluginInfo.java:114) ~[elasticsearch-5.5.1.jar:5.5.1]
	at org.elasticsearch.plugins.PluginsService.getModuleBundles(PluginsService.java:273) ~[elasticsearch-5.5.1.jar:5.5.1]
	at org.elasticsearch.plugins.PluginsService.<init>(PluginsService.java:117) ~[elasticsearch-5.5.1.jar:5.5.1]
	at org.elasticsearch.node.Node.<init>(Node.java:312) ~[elasticsearch-5.5.1.jar:5.5.1]
	at org.elasticsearch.node.Node.<init>(Node.java:244) ~[elasticsearch-5.5.1.jar:5.5.1]
	at org.elasticsearch.bootstrap.Bootstrap$5.<init>(Bootstrap.java:232) ~[elasticsearch-5.5.1.jar:5.5.1]
	at org.elasticsearch.bootstrap.Bootstrap.setup(Bootstrap.java:232) ~[elasticsearch-5.5.1.jar:5.5.1]
	at org.elasticsearch.bootstrap.Bootstrap.init(Bootstrap.java:351) ~[elasticsearch-5.5.1.jar:5.5.1]
	at org.elasticsearch.bootstrap.Elasticsearch.init(Elasticsearch.java:123) ~[elasticsearch-5.5.1.jar:5.5.1]
	... 6 more
2

I have found the error. Was opening the plugins and modules folders with Finder, which created DS_Store files and Elasticsearch would not start again. The solution was just to remove those files.

3

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