With the following little piece of code you can accomplish that.

Code

function myFind() {
  var ss = SpreadsheetApp.getActive(), output = [];
  var findData = ss.getSheetByName('fr').getDataRange().getValues();
  var searchData = ss.getSheetByName('cql').getDataRange().getValues();

  for(var i=1, iLen=findData.length; i<iLen; i++) {  
    for(var j=0, jLen=searchData.length; j<jLen; j++) {
      for(var k=0, kLen=searchData[0].length; k<kLen; k++) {
        var find = findData[i][0];
        if(find == searchData[j][k]) {
          output.push([find, "row "+(j+1)+"; "+"col "+(k+1)]);
        }
      }
    }
  }
  return output;
}

Explained

Both data ranges are "captured" at once via the .getDataRange.getValues() method. The 2d array, that's being returned, includes empty rows and columns. This means that all we need to do is correct for the zero based array and we have a row and column index. Through the iterations (note the var i=1 to skip the header), the result is being pushed into an output array. Finally, the output is returned.

Screenshot

find

search

result

Example

I've created an example file for you: get cell row and column index

Short answer

=ArrayFormula(vlookup(ROW(1:10),{IF(LEN(A1:A10)>0,ROW(1:10),""),A1:A10},2))

Explanation

Assuming the input data in the Column A of the below table and that the above formula is in cell B1.

Note: In order to make easier to evaluate the formula, the Column A (input) doesn't repeat values but it will work with any kind of values (letters, numbers, symbols, repeated, unsorted, etc.)

      |    A       B   
  === + ======= =======
   1  |    a       a   
   2  |            a   
   3  |    b       b   
   4  |            b   
   5  |            b   
   6  |    c       c   
   7  |    d       d   
   8  |    e       e   
   9  |            e   
  10  |    f       f   

VLOOKUP was selected as it could be used to find approximate values and it could return multiple values (array).

As the input values could appear in any order, instead of using the actual values, the row number was used for non empty cells and empty cells have assigned an empty string "".

It was used LEN instead of ISBLANK because cells with formulas that return an empty string return FALSE and this could cause problems in some common scenarios.

IF(LEN(A1:A10)>0,ROW(1:10),"")

NOTE: In you want to save three characters, the second parameter ("" the character is the parameter separator ,) could be removed. When analysing this part of formula empty cells will return FALSE.

As VLOOKUP requires that the lookup up column be the first column, instead of a range, a "semi-manually" made array was used.

{IF(LEN(A1:A10)>0,ROW(1:10),""),A1:A10}

The above approach save us cells and processing time.