L2norm script in source compiles error because Cannot cast from [double] to [int]

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1 
"source": "double norm=l2norm(params.queryVector, 'vec')^2; return 1/(1+norm);"

or

"source": "1/(1+l2norm(params.queryVector, 'vec')^2)"

or

"source": "1.0/(1.0+l2norm(params.queryVector, 'vec')^2)"

all result in

"caused_by" : {
      "type" : "script_exception",
      "reason" : "compile error",
      "script_stack" : [
        "double norm=l2norm(params.queryVector ...",
        "            ^---- HERE"
      ],
      "script" : "double norm=l2norm(params.queryVector, 'vec')^2; return 1/(1+norm);",
      "lang" : "painless",
      "position" : {
        "offset" : 12,
        "start" : 0,
        "end" : 37
      },
      "caused_by" : {
        "type" : "class_cast_exception",
        "reason" : "Cannot cast from [double] to [int]."
      }
    }

or

"caused_by" : {
      "type" : "script_exception",
      "reason" : "compile error",
      "script_stack" : [
        "1.0/(1.0+l2norm(params.queryVe ...",
        "     ^---- HERE"
      ],
      "script" : "1.0/(1.0+l2norm(params.queryVector, 'vec')^2)",
      "lang" : "painless",
      "position" : {
        "offset" : 5,
        "start" : 0,
        "end" : 30
      },
      "caused_by" : {
        "type" : "class_cast_exception",
        "reason" : "Cannot cast from [double] to [int]."
      }
    }

How to fix Cannot cast from [double] to [int].? The following does not have such error by removing ^2, which is required by script formula:

"source": "1.0/(1.0+l2norm(params.queryVector, 'vec'))"
2

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