def count_src(self, src):
        if isinstance(src, str):
            src = [src]
        cnt_d = {}
        for _src in src:
            q = {
                "query": {
                    "constant_score": {
                        "filter": {
                            "exists": {"field": _src}
                        }
                    }
                }
            }
            cnt_d[_src] = self.count(q)
        return cnt_d