How to create crontab file for user elastic search which is installed in user root

Elastic Stack Elasticsearch
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  1. how to install crontabs on user elasticsearch ?

  2. how to add crontab jobs for user elastic search where crontabs is installed in user root?

whole process is being done in docker file

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You opened a similar question with How to create a crontab file for user elasticsearch. Let's keep the discussion in a single place. Thanks.