undeploy models with no WorkerNodes

This commit aims to undeploy modelIds that have no nodes associated to them so as to keep the intention of undeploy truthful.

Signed-off-by: Brian Flores <[email protected]>

# Conflicts:
#	plugin/src/main/java/org/opensearch/ml/action/undeploy/TransportUndeployModelsAction.java

Author: brianf-aws

plugin/src/main/java/org/opensearch/ml/action/undeploy/TransportUndeployModelsAction.java

@@ -7,17 +7,21 @@
 
 import static org.opensearch.ml.common.CommonValue.ML_MODEL_INDEX;
 
+import java.time.Instant;
 import java.util.Arrays;
 import java.util.List;
 import java.util.stream.Collectors;
 
 import org.opensearch.ExceptionsHelper;
 import org.opensearch.OpenSearchStatusException;
 import org.opensearch.action.ActionRequest;
+import org.opensearch.action.bulk.BulkRequest;
 import org.opensearch.action.search.SearchRequest;
 import org.opensearch.action.search.SearchResponse;
 import org.opensearch.action.support.ActionFilters;
 import org.opensearch.action.support.HandledTransportAction;
+import org.opensearch.action.support.WriteRequest;
+import org.opensearch.action.update.UpdateRequest;
 import org.opensearch.client.Client;
 import org.opensearch.cluster.service.ClusterService;
 import org.opensearch.common.inject.Inject;
@@ -33,6 +37,7 @@
 import org.opensearch.index.query.TermsQueryBuilder;
 import org.opensearch.ml.cluster.DiscoveryNodeHelper;
 import org.opensearch.ml.common.MLModel;
+import org.opensearch.ml.common.model.MLModelState;
 import org.opensearch.ml.common.transport.deploy.MLDeployModelRequest;
 import org.opensearch.ml.common.transport.undeploy.MLUndeployModelAction;
 import org.opensearch.ml.common.transport.undeploy.MLUndeployModelNodesRequest;
@@ -57,6 +62,7 @@
 import org.opensearch.transport.TransportService;
 
 import com.google.common.annotations.VisibleForTesting;
+import com.google.common.collect.ImmutableMap;
 
 import lombok.extern.log4j.Log4j2;
 
@@ -180,10 +186,36 @@ private void undeployModels(
         mlUndeployModelNodesRequest.setTenantId(tenantId);
 
         client.execute(MLUndeployModelAction.INSTANCE, mlUndeployModelNodesRequest, ActionListener.wrap(r -> {
+            if (r.getNodes().isEmpty()) {
+                bulkSetModelIndexToUndeploy(modelIds);
+            }
             listener.onResponse(new MLUndeployModelsResponse(r));
         }, listener::onFailure));
     }
 
+    private void bulkSetModelIndexToUndeploy(String[] modelIds) {
+        BulkRequest bulkUpdateRequest = new BulkRequest();
+        for (String modelId : modelIds) {
+            UpdateRequest updateRequest = new UpdateRequest();
+            Instant now = Instant.now();
+            ImmutableMap.Builder<String, Object> builder = ImmutableMap.builder();
+            builder.put(MLModel.MODEL_STATE_FIELD, MLModelState.UNDEPLOYED.name());
+
+            builder.put(MLModel.PLANNING_WORKER_NODES_FIELD, List.of());
+            builder.put(MLModel.PLANNING_WORKER_NODE_COUNT_FIELD, 0);
+
+            builder.put(MLModel.LAST_UPDATED_TIME_FIELD, now.toEpochMilli());
+            builder.put(MLModel.CURRENT_WORKER_NODE_COUNT_FIELD, 0);
+            updateRequest.index(ML_MODEL_INDEX).id(modelId).doc(builder.build());
+            bulkUpdateRequest.add(updateRequest);
+        }
+        bulkUpdateRequest.setRefreshPolicy(WriteRequest.RefreshPolicy.IMMEDIATE);
+        log.info("No models service: {}", modelIds.toString());
+        client.bulk(bulkUpdateRequest, ActionListener.wrap(br -> { log.debug("Successfully set modelIds to UNDEPLOY in index"); }, e -> {
+            log.error("Failed to set modelIds to UNDEPLOY in index", e);
+        }));
+    }
+
     private void validateAccess(String modelId, String tenantId, ActionListener<Boolean> listener) {
         User user = RestActionUtils.getUserContext(client);
         boolean isSuperAdmin = isSuperAdminUserWrapper(clusterService, client);