Unfortunately format json is not supported anymore for OpenSearch 3.0 and newer. See https://github.com/opensearch-project/sql/issues/5038#issuecomment-3748655214" Current implementation of the Haystack integration does rely on it here: [https://github.com/deepset-ai/haystack-core-integrations/blob/6c8c1bfdf7466c4b5882[…]stack_integrations/document_stores/opensearch/document_store.py](https://github.com/deepset-ai/haystack-core-integrations/blob/6c8c1bfdf7466c4b5882954fcd8864a4f87dedad/integrations/opensearch/src/haystack_integrations/document_stores/opensearch/document_store.py#L2006)
Unfortunately format json is not supported anymore for OpenSearch 3.0 and newer. See opensearch-project/sql#5038 (comment)"
Current implementation of the Haystack integration does rely on it here:
https://github.com/deepset-ai/haystack-core-integrations/blob/6c8c1bfdf7466c4b5882[…]stack_integrations/document_stores/opensearch/document_store.py