In the reporting framework, we use the Aggregations object from elasticsearch quite often. In OpenSearch there is no equivalent for this object, instead the equivalent way of using it is to receive a Map<String, Aggregation> instead. In this ticket we need to refactor our code so that we no longer need this object, but instead only work with maps.

Please note: The Aggregations object from ElasticSearch has a "asMap(...)" method, which should make this transition easy