Relax error handling in transport disk usage API

docs/changelog/84774.yaml

@@ -0,0 +1,5 @@
+pr: 84774
+summary: Increase store ref before analyzing disk usage
+area: Search
+type: bug
+issues: []

server/src/internalClusterTest/java/org/elasticsearch/action/admin/indices/diskusage/IndexDiskUsageAnalyzerIT.java

@@ -12,15 +12,65 @@
 import org.elasticsearch.action.support.PlainActionFuture;
 import org.elasticsearch.cluster.metadata.IndexMetadata;
 import org.elasticsearch.common.settings.Settings;
+import org.elasticsearch.common.util.CollectionUtils;
+import org.elasticsearch.common.util.set.Sets;
+import org.elasticsearch.index.Index;
+import org.elasticsearch.index.IndexSettings;
+import org.elasticsearch.index.engine.EngineException;
+import org.elasticsearch.index.engine.EngineFactory;
+import org.elasticsearch.index.engine.InternalEngine;
+import org.elasticsearch.index.shard.ShardId;
+import org.elasticsearch.plugins.EnginePlugin;
+import org.elasticsearch.plugins.Plugin;
 import org.elasticsearch.test.ESIntegTestCase;
 import org.elasticsearch.xcontent.XContentBuilder;
 import org.elasticsearch.xcontent.XContentFactory;
+import org.junit.Before;
+
+import java.util.Collection;
+import java.util.List;
+import java.util.Optional;
+import java.util.Set;
+import java.util.stream.IntStream;
 
 import static org.hamcrest.Matchers.equalTo;
 import static org.hamcrest.Matchers.greaterThan;
 
 public class IndexDiskUsageAnalyzerIT extends ESIntegTestCase {
 
+    @Override
+    protected boolean addMockInternalEngine() {
+        return false;
+    }
+
+    @Override
+    protected Collection<Class<? extends Plugin>> nodePlugins() {
+        return CollectionUtils.appendToCopy(super.nodePlugins(), EngineTestPlugin.class);
+    }
+
+    private static final Set<ShardId> failOnFlushShards = Sets.newConcurrentHashSet();
+
+    public static class EngineTestPlugin extends Plugin implements EnginePlugin {
+        @Override
+        public Optional<EngineFactory> getEngineFactory(IndexSettings indexSettings) {
+            return Optional.of(config -> new InternalEngine(config) {
+                @Override
+                public void flush(boolean force, boolean waitIfOngoing) throws EngineException {
+                    final ShardId shardId = config.getShardId();
+                    if (failOnFlushShards.contains(shardId)) {
+                        throw new EngineException(shardId, "simulated IO");
+                    }
+                    super.flush(force, waitIfOngoing);
+                }
+            });
+        }
+    }
+
+    @Before
+    public void resetFailOnFlush() throws Exception {
+        failOnFlushShards.clear();
+    }
+
     public void testSimple() throws Exception {
         final XContentBuilder mapping = XContentFactory.jsonBuilder();
         mapping.startObject();
@@ -98,6 +148,43 @@ public void testSimple() throws Exception {
         assertMetadataFields(stats);
     }
 
+    public void testFailOnFlush() throws Exception {
+        final String indexName = "test-index";
+        int numberOfShards = between(1, 5);
+        client().admin()
+            .indices()
+            .prepareCreate(indexName)
+            .setSettings(
+                Settings.builder()
+                    .put(IndexMetadata.SETTING_NUMBER_OF_SHARDS, numberOfShards)
+                    .put(IndexMetadata.SETTING_NUMBER_OF_REPLICAS, between(0, 1))
+            )
+            .get();
+        ensureGreen(indexName);
+        int numDocs = randomIntBetween(1, 10);
+        for (int i = 0; i < numDocs; i++) {
+            int value = randomIntBetween(1, 10);
+            final XContentBuilder doc = XContentFactory.jsonBuilder()
+                .startObject()
+                .field("english_text", English.intToEnglish(value))
+                .field("value", value)
+                .endObject();
+            client().prepareIndex(indexName).setId("id-" + i).setSource(doc).get();
+        }
+        Index index = clusterService().state().metadata().index(indexName).getIndex();
+        List<ShardId> failedShards = randomSubsetOf(
+            between(1, numberOfShards),
+            IntStream.range(0, numberOfShards).mapToObj(n -> new ShardId(index, n)).toList()
+        );
+        failOnFlushShards.addAll(failedShards);
+        AnalyzeIndexDiskUsageResponse resp = client().execute(
+            AnalyzeIndexDiskUsageAction.INSTANCE,
+            new AnalyzeIndexDiskUsageRequest(new String[] { indexName }, AnalyzeIndexDiskUsageRequest.DEFAULT_INDICES_OPTIONS, true)
+        ).actionGet();
+        assertThat(resp.getTotalShards(), equalTo(numberOfShards));
+        assertThat(resp.getFailedShards(), equalTo(failedShards.size()));
+    }
+
     void assertMetadataFields(IndexDiskUsageStats stats) {
         final IndexDiskUsageStats.PerFieldDiskUsage sourceField = stats.getFields().get("_source");
         assertThat(sourceField.getInvertedIndexBytes(), equalTo(0L));

server/src/main/java/org/elasticsearch/action/admin/indices/diskusage/TransportAnalyzeIndexDiskUsageAction.java

@@ -8,6 +8,7 @@
 
 package org.elasticsearch.action.admin.indices.diskusage;
 
+import org.elasticsearch.ExceptionsHelper;
 import org.elasticsearch.action.ActionListener;
 import org.elasticsearch.action.NoShardAvailableActionException;
 import org.elasticsearch.action.support.ActionFilters;
@@ -109,8 +110,10 @@ protected AnalyzeIndexDiskUsageResponse newResponse(
             if (r instanceof AnalyzeDiskUsageShardResponse resp) {
                 ++successfulShards;
                 combined.compute(resp.getIndex(), (k, v) -> v == null ? resp.stats : v.add(resp.stats));
-            } else if (r instanceof DefaultShardOperationFailedException) {
-                shardFailures.add((DefaultShardOperationFailedException) r);
+            } else if (r instanceof DefaultShardOperationFailedException e) {
+                shardFailures.add(e);
+            } else if (r instanceof Exception e) {
+                shardFailures.add(new DefaultShardOperationFailedException(ExceptionsHelper.convertToElastic(e)));
             } else {
                 assert false : "unknown response [" + r + "]";
                 throw new IllegalStateException("unknown response [" + r + "]");