I am trying to upgrade ES cluster from 2.4 to 5.2. It seems that x-pack (security) plugin and ReadonlyREST are conflicting each other. We are not using security plugin with our licence. I get the following exceptions on node startup:
org.elasticsearch.bootstrap.StartupException: java.lang.IllegalArgumentException: Cannot have more than one plugin implementing a REST wrapper
at org.elasticsearch.bootstrap.Elasticsearch.init(Elasticsearch.java:125) ~[elasticsearch-5.2.0.jar:5.2.0]
at org.elasticsearch.bootstrap.Elasticsearch.execute(Elasticsearch.java:112) ~[elasticsearch-5.2.0.jar:5.2.0]
at org.elasticsearch.cli.SettingCommand.execute(SettingCommand.java:54) ~[elasticsearch-5.2.0.jar:5.2.0]
at org.elasticsearch.cli.Command.mainWithoutErrorHandling(Command.java:122) ~[elasticsearch-5.2.0.jar:5.2.0]
at org.elasticsearch.cli.Command.main(Command.java:88) ~[elasticsearch-5.2.0.jar:5.2.0]
at org.elasticsearch.bootstrap.Elasticsearch.main(Elasticsearch.java:89) ~[elasticsearch-5.2.0.jar:5.2.0]
at org.elasticsearch.bootstrap.Elasticsearch.main(Elasticsearch.java:82) ~[elasticsearch-5.2.0.jar:5.2.0]
Caused by: java.lang.IllegalArgumentException: Cannot have more than one plugin implementing a REST wrapper
at org.elasticsearch.action.ActionModule.<init>(ActionModule.java:351) ~[elasticsearch-5.2.0.jar:5.2.0]
at org.elasticsearch.node.Node.<init>(Node.java:354) ~[elasticsearch-5.2.0.jar:5.2.0]
at org.elasticsearch.node.Node.<init>(Node.java:232) ~[elasticsearch-5.2.0.jar:5.2.0]
at org.elasticsearch.bootstrap.Bootstrap$6.<init>(Bootstrap.java:241) ~[elasticsearch-5.2.0.jar:5.2.0]
at org.elasticsearch.bootstrap.Bootstrap.setup(Bootstrap.java:241) ~[elasticsearch-5.2.0.jar:5.2.0]
at org.elasticsearch.bootstrap.Bootstrap.init(Bootstrap.java:333) ~[elasticsearch-5.2.0.jar:5.2.0]
at org.elasticsearch.bootstrap.Elasticsearch.init(Elasticsearch.java:121) ~[elasticsearch-5.2.0.jar:5.2.0]
... 6 more
Is there a way to use ReadonlyREST and disable x-pack security or the only possible solution is to use either x-pack, either ReadonlyREST plugin?
Thanks for you help.