Fix JsonGenerationException

✅ Solution

JsonGenerationException in Elasticsearch/ELK often arises when trying to index an object containing data types that the Elasticsearch JSON serializer cannot handle directly (e.g., certain date-time formats or custom objects). To fix this, ensure that indexed data conforms to expected Elasticsearch data types by either converting incompatible fields to strings before indexing or explicitly mapping the field's data type in the Elasticsearch index mapping. Specifically check the datatypes of the fields involved in aggregations/queries that are failing.