I suppose you are referring to actions in the alerting code. This is currently not extensible with external plugins, but needs to be within the alerting/watcher plugin. If you think others can benefit from this as well, feel free to open a github issue to discuss if people are interested in this functionality.
If it is very customized, it is unlikely that it will be taken into the main branch. the only other thing I see is that there is infrastructure to be able to register own inputs and actions - which right now is not there.
Maybe open an issue in the Elasticsearch repository to discuss this further, if that is feasible for the development team or not.
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