The documentation says : https://firebase.google.com/docs/firestore/query-data/indexing
To delete an index:
Go to the Cloud Firestore section of the Firebase console. Click the Indexes tab. Hover over the index you want to delete and select Delete from the context menu. Confirm that you want to delete it by clicking Delete from the alert.
On current Cloud Firestore ,
- Single field index can be deleted by using right submenu
- But hovering doest work and submenu are inexistent for composite index section
I have only found a console command to delete all indexed for a firestore db
