in flink-connector-opensearch/src/main/java/org/apache/flink/streaming/connectors/opensearch/OpensearchSink.java [437:449]
private void verifyClientConnection(RestHighLevelClient client) throws IOException {
if (LOG.isInfoEnabled()) {
LOG.info("Pinging Opensearch cluster via hosts {} ...", httpHosts);
}
if (!client.ping(RequestOptions.DEFAULT)) {
throw new RuntimeException("There are no reachable Opensearch nodes!");
}
if (LOG.isInfoEnabled()) {
LOG.info("Opensearch RestHighLevelClient is connected to {}", httpHosts.toString());
}
}