Hi , about copying index data of elasticsearch ,i have a question. can you give me a suggestion?

i had build a elasticsearch cluster in one idc of city A, at the same time,
indexing in city A.
but in some time,i need have the same cluster in city B,including index
data. can i copy the index data of city A to cluster of city B but index in
city B again?
if this idea if ok,what i should do in detail.(i use es just one month)
i am waiting for replay.thanks very much.

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