How to install xpack for elasticsearch running on docker?

i'm trying to install xpack on a ELK-Stack. I will do this with 3 Dockerfiles. At this moment my Dockerfile look like this:

# Orginal Image von elasticsearch laden
FROM docker.marksys.de/elasticsearch:latest
USER root

ADD ./x-pack-5.5.2.zip /usr/share/elasticsearch/plugins

RUN bin/elasticsearch-plugin install file:///usr/share/elasticsearch/plugins/x-pack-5.5.2.zip/
RUN elasticsearch

Every time, when I build the Dockerfile to an image, the Build Process stops here:

Exception in thread "main" java.lang.IllegalStateException: Could not load plugin descriptor for existing plugin [x-pack-5.5.2.zip]. Was the plugin built before 2.0?
    at org.elasticsearch.plugins.PluginsService.getPluginBundles(PluginsService.java:334)
    at org.elasticsearch.plugins.InstallPluginCommand.jarHellCheck(InstallPluginCommand.java:518)
    at org.elasticsearch.plugins.InstallPluginCommand.verify(InstallPluginCommand.java:500)
    at org.elasticsearch.plugins.InstallPluginCommand.install(InstallPluginCommand.java:543)
    at org.elasticsearch.plugins.InstallPluginCommand.execute(InstallPluginCommand.java:217)
    at org.elasticsearch.plugins.InstallPluginCommand.execute(InstallPluginCommand.java:201)
    at org.elasticsearch.cli.EnvironmentAwareCommand.execute(EnvironmentAwareCommand.java:67)
    at org.elasticsearch.cli.Command.mainWithoutErrorHandling(Command.java:122)
    at org.elasticsearch.cli.MultiCommand.execute(MultiCommand.java:69)
    at org.elasticsearch.cli.Command.mainWithoutErrorHandling(Command.java:122)
    at org.elasticsearch.cli.Command.main(Command.java:88)
    at org.elasticsearch.plugins.PluginCli.main(PluginCli.java:47)
Caused by: java.nio.file.FileSystemException: /usr/share/elasticsearch/plugins/x-pack-5.5.2.zip/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)
    at java.nio.file.Files.newByteChannel(Files.java:407)
    at java.nio.file.spi.FileSystemProvider.newInputStream(FileSystemProvider.java:384)
    at java.nio.file.Files.newInputStream(Files.java:152)
    at org.elasticsearch.plugins.PluginInfo.readFromProperties(PluginInfo.java:114)
    at org.elasticsearch.plugins.PluginsService.getPluginBundles(PluginsService.java:331)
    ... 11 more

I think the install-process can't find the /x-pack-5.5.2.zip/plugin-descriptor.properties file.

The ZIP-structure look like this:

x-pack-5.5.2.zip

• elasticsearch -content
• Kibana -content
• logstash -content

Does someone know a good Tutorial for this?

I solved the problem:

In my question above you can see that i add the zip to the /usr/share/elasticsearch/plugins. The problem is, that elastics. can't open the zip from this directory.

My solution: Add the zip in a new or other directory and start the build-process again. In my case I added the zip in /usr/share/elasticsearch.

Greetings TheLegend31