https://www.elastic.co/docs/api/doc/elasticsearch/v8/operation/operation-indices-exists-template
Check existence of index templates | Elasticsearch API documentation (v8)
Get information about whether index templates exist. Index templates define settings, mappings, and aliases that can be applied automatically to new indices....
check existenceindex templateselasticsearch apidocumentationv8
https://www.baeldung.com/mongodb-check-field-exists
How to Check Field Existence in MongoDB? | Baeldung
Jan 8, 2024 - Learn how to check if a field exists in MongoDB.
how to checkfieldexistencemongodbbaeldung