Search Task with serachTaskIndexed

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1

I need help.

I search task in MWS to use searchTaskIndexed service.
Fields is “AssignedToList”, Operator is “=” and Value is “nameUser”.
But The output values are all task with assignedToList is “nameUser” OR delegatedToList is “nameUser”.
what should i do if I want get the out value are just only task with assignedToList is “nameUser” ?

Please help.

Thank You