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Description
🐛 Wrong type
CompositeAggregation.sources contains a list of subaggregations. The are represented using CompositeAggregationSource that holds TermsAggregation, HistogramAggregation, etc.
Reusing aggregation types doesn't work because "Although similar, the terms value source doesn’t support the same set of parameters as the terms aggregation". These differences that make it incompatible with TermsAggregation.
Additionally, CompositeAggregation.source should be Array<SingleKeyDictionary<string, CompositeAggregationSource>> (and not Dictionary) and CompositeAggregationSource should be a container.