OpenSearch/OpenDistro are AWS run products and differ from the original Elasticsearch and Kibana products that Elastic builds and maintains. You may need to contact them directly for further assistance.
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Opensearch is not supported here, you need to check on an Opensearch forum.
But if the Opensearch output is similar to the Elasticsearch output, then there is no option to change the codec as the codec needs to be and already is json.
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