DateHistogram Aggregation over indices split by month

Elastic Stack Elasticsearch
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I do know that ElasticSearch can query across multiple indices when specified, but will it aggregate results that fall into the same bucket but were found in different indices. An example to clarify: A 7 day aggregation starting on the 25 of January. The first bucket in this example would contain data from both the index for the month of January and from the index for the month of Feb. Will it correctly aggregate the results into the bucket and is there a performance hit in doing this?

Thanks,
Arvind

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Yes, that is not a problem.

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