got query of type.
this query runs without outputing a message if primaryWord not equal secondaryWord (the first "B" not same as second "B").
there's 1000's of combinations in the DB, and only those with both sub documents the same will throw the message/ run slow.
my workaround: i dont query for these combinations anymore.

Wed May 01 06:48:28.435 [conn348] query bauhaus.MDocument query: { $and: [

{ _is Deleted: false }

,

{ _basedOn: "$system.SearchPhraseCombination" }

, { _attributes
: { $elemMatch:

{ _basedOn: "$system.PrimaryWord", _isDeleted: false, _valueText : "B" }

} }, { _attributes: { $elemMatch:

{ _basedOn: "$system.SecondaryWord", _ isDeleted: false, _valueText: "B" }

} } ] } ntoreturn:0 ntoskip:0 nscanned:28007
keyUpdates:0 locks(micros) r:165221 nreturned:0 reslen:20 165ms