udpdated changelog.md to update release notes

General MR

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Upgrade Notices

Elasticsearch Statefulsets Update Strategy are set to OnDelete, so in order for the changes in this package mr to take effect (i.e tunneling certificates/mtls handling through istio-proxy) 1) istio must be enabled and 2) the elasticsearch pods need to be manually deleted (for more information see kubernetes documentation on statefulsets updates strategies).