Downgrade from 5.0.0-alpha to 2.4.1 Fails

Elastic Stack Elasticsearch
1

Installed 5.0.0-alpha on CentOS 7 (VirtualBox) which worked ok but I had some issues with the JAVA API documentation. Tried to downgrade to 2.4.1 and when ES starts I get the following error (appears on the cluster log file:

[2016-10-14 09:40:11,830][INFO ][node                     ] [kobi-node] version[2.4.1], pid[4420], bui
ld[c67dc32/2016-09-27T18:57:55Z]
[2016-10-14 09:40:11,848][INFO ][node                     ] [kobi-node] initializing ...
[2016-10-14 09:40:11,862][ERROR][bootstrap                ] Exception
java.lang.IllegalStateException: Unable to initialize modules
	at org.elasticsearch.plugins.PluginsService.<init>(PluginsService.java:121)
	at org.elasticsearch.node.Node.<init>(Node.java:158)
	at org.elasticsearch.node.Node.<init>(Node.java:140)
	at org.elasticsearch.node.NodeBuilder.build(NodeBuilder.java:143)
	at org.elasticsearch.bootstrap.Bootstrap.setup(Bootstrap.java:194)
	at org.elasticsearch.bootstrap.Bootstrap.init(Bootstrap.java:286)
	at org.elasticsearch.bootstrap.Elasticsearch.main(Elasticsearch.java:35)
Caused by: java.nio.file.NoSuchFileException: /usr/share/elasticsearch/modules/aggs-matrix-stats/plugi
n-descriptor.properties
	at sun.nio.fs.UnixException.translateToIOException(UnixException.java:86)
	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:87)
	at org.elasticsearch.plugins.PluginsService.getModuleBundles(PluginsService.java:335)
	at org.elasticsearch.plugins.PluginsService.<init>(PluginsService.java:114)
	... 6 more

I tried to list my plugins and there are none. Also both "modules" and "plugins" folders are empty under /usr/share/elasticsearch. Any ideas?

Thanks,
Kobi

2

Reinstall completely a fresh new version You can not downgrade.

Here internal modules 5.0 are not compatible with modules 2.x.

3

Hey,

can you uninstall the 5.0 version AND delete the /usr/share/elasticsearch/modules/ directory by hand. Then install 2.4 - seems there are some leftover from 5.0...

--Alex

4

Thanks for the tip.
Decided to uninstall and remove any relevant leftover folders altogether. Then re-installed 2.4.1 - Seems to do the trick.