How to install Analysis Plugins in Azure Kubernetes version 1.91 in 3 Elasticsearch pods ver. 7.13.3 with ECK 1.6 or any other method

Need to install plugins for APAC languages and environment is in Azure Kubernetes ver. 1.91 with Elasticsearch ver. 7.13.3 with 3 pods. (master/ingest/client).

Instructions seen so far are for VMs in Azure.
Analysis Plugins | Elasticsearch Plugins and Integrations [7.13] | Elastic

Please any help/feedback is greatly appreciated of how to install plugins within Kubernetes.