Automatically set a programmatically-created Google Doc to the correct owner.

script.gs

/*********** SETUP ***************/

// Store two global variables with columns to use as references.
// These should be zero-based because they're used in a loop.

var docIdCol = 0  // Int of col to check for a document ID
var emailCol = 0  // Int of col with submitter email address

/********** END SETUP **************/

function setDocOwner() {

  var doc, isEmail, isSet, newOwner
  
  var ss = SpreadsheetApp.getActiveSpreadsheet();
  var sheet = ss.getSheetByName('your-sheet');
  var lastCol = sheet.getLastColumn();
  var rows = sheet.getRange(1, 1, sheet.getLastRow(), sheet.getLastColumn()).getValues();
  
  // Use regex to check that emailCol is actually an email address
  var re = new RegExp('[A-Za-z0-9_%+-]+@[A-Za-z0-9.-]+','i');
  
  // Looping from the bottom runs faster
  for(var i = rows.length -1; i>=0; i--) {

    isEmail = re.exec(rows[i][emailCol])
    isSet = rows[i][lastCol];
    
    if(!isSet && isEmail) {
    
      doc = DriveApp.getFileById(rows[i][docIdCol])
      
      if(doc.getOwner !== newOwner) {
        trySet(doc, newOwner, lastCol, i+1);
      } 
    }
  }
}

function trySet(doc, email, lastCol, row) {
  
  try {
    doc.setOwner(email)
    sheet.getRange(row, lastCol).setValue('Set owner as ' + email);
  } catch(e) {
    sheet.getRange(row, lastCol).setValue(e.message)
  }
  
}