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How to write a query in Nifi GetMongo processor

How to write a query in Nifi GetMongo processor

New Contributor

I'm trying to write queries in the query property of the nifi GetMongo processor. I'm able to write simple query like
{ "field" : "value"}
or
{ "field1" : "value1",
 "field2" : "value2"}
but I'm struggling to understand the properly sintax or the right usage of operators to run an OR condition query, an ORDER BY query, a comparison query or a regex query (like any other complex query).
I didn't find no resources, guides or documentation able to help me; would you please suggest me some tips or solutions?