Avoid running simulate pipeline request on coordinating only node.

Relates to #79074

Author: martijnvg

modules/ingest-geoip/src/internalClusterTest/java/org/elasticsearch/ingest/geoip/GeoIpDownloaderIT.java

@@ -16,6 +16,7 @@
 import org.elasticsearch.action.ingest.SimulatePipelineRequest;
 import org.elasticsearch.action.ingest.SimulatePipelineResponse;
 import org.elasticsearch.action.search.SearchResponse;
+import org.elasticsearch.client.Client;
 import org.elasticsearch.cluster.node.DiscoveryNode;
 import org.elasticsearch.common.bytes.BytesReference;
 import org.elasticsearch.common.settings.Settings;
@@ -428,7 +429,10 @@ private SimulateDocumentBaseResult simulatePipeline() throws IOException {
         }
         SimulatePipelineRequest simulateRequest = new SimulatePipelineRequest(bytes, XContentType.JSON);
         simulateRequest.setId("_id");
-        SimulatePipelineResponse simulateResponse = client().admin().cluster().simulatePipeline(simulateRequest).actionGet();
+        // Avoid executing on a coordinating only node, because databases are not available there and geoip processor won't do any lookups.
+        // (some test seeds repeatedly hit such nodes causing failures)
+        Client client = dataNodeClient();
+        SimulatePipelineResponse simulateResponse = client.admin().cluster().simulatePipeline(simulateRequest).actionGet();
         assertThat(simulateResponse.getPipelineId(), equalTo("_id"));
         assertThat(simulateResponse.getResults().size(), equalTo(1));
         return (SimulateDocumentBaseResult) simulateResponse.getResults().get(0);