How to split an existing index based on number of documents

We have an index of size 70GB which contains 73 million documents and we want to split this index based on number of documents.
Is there any way we can divide the current index by taking number of documents into consideration?

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Not easily I don't think, no. Why do you want to take this approach though?

Because we want to separate year wise data into separate index.

If splitting an index using document count is not possible then can we split it by taking size into consideration? Like for every 10 GB data into a separate index.

Does that mean you have timestamps in your data? If so, that's easier to work with.

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