Recovering a deleted index without a snapshot can be challenging because, without a backup, the index data is permanently lost. However, there are a few things you can try to recover some of the data or recreate the index, depending on your specific situation:
Check the Recycle Bin or Trash: If you are using a system like Elasticsearch, some versions have a feature called "Recycle Bin" or "Trash" that retains deleted data for a certain period. Check if your Elasticsearch version supports this feature and if any deleted indices might still be recoverable.
Check for Replicas: If you had replicas configured for the index before it was deleted, you might be able to recover some data from the replicas. Replicas are copies of the primary shards, and they might still contain the data until they are deleted too.
Check Database Backups: If you are using a database engine like MySQL, PostgreSQL, or MongoDB, check if you have any recent backups that include the data from the deleted index. If you have regular backups, you might be able to restore the data from a previous state.
Check Log Files: Some database systems maintain transaction logs or binlogs that record all changes to the data. These logs might contain information about the deleted index or the changes made to it. If you have access to these logs, you might be able to recover some data.
Check Source Code or Data Generation Tools: If the data in the index was generated or imported from another source, you might be able to regenerate or re-import the data using the original source code or data generation tools.
Recreate the Index: If none of the above options are viable, you might need to recreate the index and repopulate it with data from other sources or by using your application's functionality.
Remember that data recovery without a backup is not guaranteed, and there might be limitations depending on the database engine or indexing system you are using. It is always crucial to have regular backups of your data to avoid permanent data loss in case of accidental deletions or other issues.