I am working on an appilcation that needs Archival of data wrt date created. I am planning to create two seprate MongoDB cluster with same collection names. So, is there any library or tech is there like Mongo Atlas Online archive/ data lake for free? to fecth/query from two different database at the single query? Mongo data lake having the unified interface to fetch data from two DBs with single query, which involves cost. Is there any free alternative to it?
I am using Java& Sprinboot for my backend