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[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
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