I want to delete index that I don't use and keep just what I need, how can I do this ?
You can delete an index using the delete api, take a look at : https://www.elastic.co/guide/en/elasticsearch/reference/current/indices-delete-index.html
If you want to delete fields inside an index there is no good way to do that in ES. You need to create a new index with just the necessary fields and reindex from the old index.
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