Workbench: Replace Elasticsearch with Opensearch.

The Python library and Curator to allow working with Opensearch clusters
as well as Elasticsearch.

workbench/Dockerfile

@@ -173,8 +173,8 @@ RUN apt-get update && \
         cryptography \
         dnspython \
         docker \
-        elasticsearch-curator \
-        elasticsearch[async] \
+        curator-opensearch \
+        opensearch-py[async] \
         fabric \
         flit \
         github3.py \