Deleting and closing indexes in Elasticsearch - Cheat Sheet & Quick Revision

Recall & Review

beginner

What does it mean to delete an index in Elasticsearch?

Deleting an index means permanently removing the index and all its data from Elasticsearch. This action cannot be undone.

beginner

What is the difference between closing and deleting an index?

Closing an index makes it unavailable for search and indexing but keeps its data on disk. Deleting removes the index and its data completely.

beginner

Which HTTP method and endpoint is used to delete an index named my-index?

Use the DELETE method on the endpoint /my-index to delete the index.

beginner

How do you close an index named my-index using Elasticsearch API?

Send a POST request to /my-index/_close to close the index.

intermediate

Why might you want to close an index instead of deleting it?

Closing an index saves system resources by freeing memory and file handles but keeps data intact for later reopening without reindexing.

What happens when you delete an Elasticsearch index?

A The index is archived for later use.

B The index is temporarily hidden but data remains.

C The index is backed up automatically.

D The index and all its data are permanently removed.

Deleting an index removes it and all its data permanently from Elasticsearch.

Which HTTP method is used to close an index?

A DELETE

B GET

C POST

D PUT

Closing an index requires a POST request to the /_close endpoint.

What is the endpoint to delete an index named logs?

A /logs

B /logs/_delete

C /logs/_close

D /logs/_remove

To delete an index, send a DELETE request to the index name endpoint, e.g., /logs.

What is a benefit of closing an index instead of deleting it?

A It keeps data but frees system resources.

B It frees up disk space.

C It automatically reindexes data.

D It makes the index read-only.

Closing an index frees memory and file handles but keeps data intact for reopening.

After closing an index, how can you make it available again?

A Delete and recreate it.

B Send a POST request to <code>/_open</code> endpoint.

C Send a GET request to the index.

D Restart Elasticsearch.

You reopen a closed index by sending a POST request to /{index}/_open.

Explain the difference between deleting and closing an Elasticsearch index and when you might use each.

Think about data permanence and resource management.

Describe the API calls needed to delete and close an index named 'my-index' in Elasticsearch.

Focus on HTTP methods and endpoints.