private boolean hasActiveExternalCalls() {
            if (hasActiveExternalCalls(pendingCalls)) {
                return true;
            }
            for (List<Call> callList : callsToSend.values()) {
                if (hasActiveExternalCalls(callList)) {
                    return true;
                }
            }
            return hasActiveExternalCalls(correlationIdToCalls.values());
        }
Return true if there are currently active external calls.
clients/src/main/java/org/apache/kafka/clients/admin/KafkaAdminClient.java