Support for Grails 5 and 6

[arkadiusz97]

I'm wondering if this plugin is compatible with Grails 5 and 6. The latest supported Grails version mentioned in documentation is 4.

[subedinarayan]

I treid with Grails 6.1.1 and got error:
Caused by: java.lang.ClassNotFoundException: org.elasticsearch.common.xcontent.NamedXContentRegistry

[miq]

We use it with Grails 6.2 in production for more than a year now.