Have any other way to expose customer rest endpoint using Elastic Search except develop plugin?

[Jingyan]

I need add my own custom REST endpoints in elastic search using org.elasticsearch.rest.*. But I know, if i develop the elastic search plugin to do this thing, I must be develop different plugin for different Elastic search version. It is a huge work i think. So I want to know whether have any other way to expose my own rest endpoint easily？