A document with the following structure needs to match the value under property according to the search criteria. As long as one is matched, the result set is calculated
.:db.coll.find({"property":{"test1_field_1":/a/}})
property
{
"_id" : ObjectId("5aaf36743e178f2e540cb6e9"),
"property" : {
"test1_field_1" : "acd",
"test1_field_2" : "3",
"xxx_field" : "hell",
"field_unknown" : "hello world"
}
}if changing the document structure is an acceptable solution, consider changing property to an array:
official documentation-multikey indexes
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