Update Field Type

Hello , Can anyone please help me ,how to update field type in existing index .I have no option to reindex .i want to convert long to keyword

I don't think you can update a field type without reindex.

is anyother solution , bcz we have ah laks of data so reindexing is not possible

You could try a runtime field - Runtime fields | Elasticsearch Guide [7.15] | Elastic

But it'll likely be resource heavy.

I will check this,Thank you for your valuable time

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