Re-creating ES Index

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Hi,

I have a few questions with respect to the situation of needing to re-create an index.

  1. Is there is any process to re-create an index apart from deleting the current one and creating it again with the documents ?
  2. During the situations of re-create, can we use the data already stored in the ES cluster ?
  3. Are there any easy ways of the doing the same without have any down-time to the running ES cluster ?

Appreciate any response on the same.

Thanks,
Karthik