When I upgrade ES from 7.0.0 to 7.9.0 my custom plugin(which contain mustache) is not working

I have placed lang-mustache-client-7.9.0.jar to libs and deleted lang-mustache folder from modules.But im getting below error.

TenantNull failed to find action [org.elasticsearch.script.mustache.SearchTemplateAction@76440dba] to execute

Same works in 7.0.0

Can someone please tell what im missing.

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