code: def ensureFulltextIndex(self, fields, minLength = None) :
          
          data = {
              "type" : "fulltext",
              "fields" : fields,
          }
          if minLength is not None :
              data["minLength"] = minLength
  
          ind = Index(self, creationData = data)
          self.indexes["fulltext"][ind.infos["id"]] = ind
          return ind
docs: Creates a fulltext index if it does not already exist, and returns it