Commits on Sep 8, 2022

1. [elasticsearch] fix node roles for clients nodes …

   This commit fix the node.roles variable for client role with
   Elasticsearch version > 8.3.0.
   
   As client nodes are nodes that don't have any other roles,
   setting the client roles is done by configuring `node.roles: []`
   (empty list).
   
   Elasticsearch chart usually define `node.roles` as an environment
   variable, however, for client nodes, setting an empty list as value of
   an environment variable isn't recognized by Elasticsearch so we were
   required to also add it to the `elasticsearch.yaml` config file (more
   details in
   elastic#1186 (comment)).
   
   Starting with Elasticsearch 8.3.0 this is not working anymore and
   Elasticsearch fails to start is a `node.roles` environment variable is
   defined with an empty list as value.
   
   This commit define the `node.roles` environment variable only if the
   `roles` list isn't empty.
   
   Fixes also the tests for the `multi` example.
   
   Relates to elastic#1186

   

   jmlrt committed Sep 8, 2022
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