public:
ESQueryCompiler(const string& query, list<pair<string, string> > *prepend_eq_conds, const string& _custom_prefix) : parser(query), custom_prefix(_custom_prefix) {
public:
ESQueryCompiler(const string& query, list<pair<string, string> > *prepend_eq_conds, const string& _custom_prefix) : parser(query), custom_prefix(_custom_prefix) {