Cannot have more than one plugin implementing a REST wrapper

• Error when installing readonlyrest to start es

at org.elasticsearch.cli.Command.main(Command. ~[elasticsearch-cli-6.4.1.jar:6.4.1]
    at org.elasticsearch.bootstrap.Elasticsearch.main(Elasticsearch. ~[elasticsearch-6.4.1.jar:6.4.1]
    at org.elasticsearch.bootstrap.Elasticsearch.main(Elasticsearch. ~[elasticsearch-6.4.1.jar:6.4.1]
Caused by: java.lang.IllegalArgumentException: Cannot have more than one plugin implementing a REST wrapper

• Solve the
  conflict between x-pack-security plugin and custom development plugin, delete x-pack-security or disable xpack security in elasticsearch.yml. xpack.security.enabled = false