Bool should query with avg score

Hello. I'm performing a bool should query and get something like this:

{"value"=>0.41639566,
"description"=>"product of:",
"details"=>
[{"value"=>1.249187,
"description"=>"sum of:",
"details"=>
[{"value"=>0.41639566,
"description"=>"ConstantScore(expert_skills:java)^2.0, product of:",
"details"=>
[{"value"=>2.0, "description"=>"boost"},
{"value"=>0.20819783, "description"=>"queryNorm"}]},
{"value"=>0.41639566,
"description"=>"ConstantScore(expert_skills:php)^2.0, product of:",
"details"=>
[{"value"=>2.0, "description"=>"boost"},
{"value"=>0.20819783, "description"=>"queryNorm"}]},
{"value"=>0.41639566,
"description"=>"ConstantScore(expert_skills:ruby)^2.0, product of:",
"details"=>
[{"value"=>2.0, "description"=>"boost"},
{"value"=>0.20819783, "description"=>"queryNorm"}]}]},
{"value"=>0.33333334, "description"=>"coord(3/9)"}]}

How could I force it to use avg scoring mode instead "description"=>"sum
of:" ?

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