[ML-DataFrame] Remove ID field from data frame indexer stats (#44848)

This is a followup to #44350. The indexer stats used to
be persisted standalone, but now are only persisted as
part of a state-and-stats document. During the review
of #44350 it was decided that we'll stick with this
design, so there will never be a need for an indexer
stats object to store its transform ID as it is stored
on the enclosing document. This PR removes the indexer
stats document ID.

Backport of #44768

client/rest-high-level/src/test/java/org/elasticsearch/client/dataframe/transforms/hlrc/DataFrameIndexerTransformStatsTests.java

@@ -31,7 +31,7 @@ public class DataFrameIndexerTransformStatsTests extends AbstractHlrcXContentTes
 
     public static DataFrameIndexerTransformStats fromHlrc(
             org.elasticsearch.client.dataframe.transforms.DataFrameIndexerTransformStats instance) {
-        return DataFrameIndexerTransformStats.withDefaultTransformId(instance.getNumPages(), instance.getNumDocuments(),
+        return new DataFrameIndexerTransformStats(instance.getNumPages(), instance.getNumDocuments(),
                 instance.getOutputDocuments(), instance.getNumInvocations(), instance.getIndexTime(), instance.getSearchTime(),
                 instance.getIndexTotal(), instance.getSearchTotal(), instance.getIndexFailures(), instance.getSearchFailures());
     }
@@ -48,16 +48,16 @@ public DataFrameIndexerTransformStats convertHlrcToInternal(
         return fromHlrc(instance);
     }
 
-    public static DataFrameIndexerTransformStats randomStats(String transformId) {
-        return new DataFrameIndexerTransformStats(transformId, randomLongBetween(10L, 10000L),
+    public static DataFrameIndexerTransformStats randomStats() {
+        return new DataFrameIndexerTransformStats(randomLongBetween(10L, 10000L),
             randomLongBetween(0L, 10000L), randomLongBetween(0L, 10000L), randomLongBetween(0L, 10000L), randomLongBetween(0L, 10000L),
             randomLongBetween(0L, 10000L), randomLongBetween(0L, 10000L), randomLongBetween(0L, 10000L), randomLongBetween(0L, 10000L),
             randomLongBetween(0L, 10000L));
     }
 
     @Override
     protected DataFrameIndexerTransformStats createTestInstance() {
-        return randomStats(DataFrameIndexerTransformStats.DEFAULT_TRANSFORM_ID);
+        return randomStats();
     }
 
     @Override

client/rest-high-level/src/test/java/org/elasticsearch/client/dataframe/transforms/hlrc/DataFrameTransformStatsTests.java

@@ -79,8 +79,7 @@ public static DataFrameTransformStats randomDataFrameTransformStats() {
             randomFrom(DataFrameTransformTaskState.values()),
             randomBoolean() ? null : randomAlphaOfLength(100),
             randomBoolean() ? null : randomNodeAttributes(),
-            // TODO: remove this ID field from the server side as it's no longer needed
-            randomStats("_all"),
+            randomStats(),
             DataFrameTransformCheckpointingInfoTests.randomDataFrameTransformCheckpointingInfo());
     }
 
@@ -132,8 +131,8 @@ public static NodeAttributes randomNodeAttributes() {
             attributes);
     }
 
-    public static DataFrameIndexerTransformStats randomStats(String transformId) {
-        return new DataFrameIndexerTransformStats(transformId, randomLongBetween(10L, 10000L),
+    public static DataFrameIndexerTransformStats randomStats() {
+        return new DataFrameIndexerTransformStats(randomLongBetween(10L, 10000L),
             randomLongBetween(0L, 10000L), randomLongBetween(0L, 10000L), randomLongBetween(0L, 10000L), randomLongBetween(0L, 10000L),
             randomLongBetween(0L, 10000L), randomLongBetween(0L, 10000L), randomLongBetween(0L, 10000L), randomLongBetween(0L, 10000L),
             randomLongBetween(0L, 10000L));

x-pack/plugin/core/src/main/java/org/elasticsearch/xpack/core/dataframe/transforms/DataFrameIndexerTransformStats.java

@@ -6,24 +6,23 @@
 
 package org.elasticsearch.xpack.core.dataframe.transforms;
 
-import org.elasticsearch.common.Nullable;
+import org.elasticsearch.Version;
 import org.elasticsearch.common.ParseField;
 import org.elasticsearch.common.io.stream.StreamInput;
 import org.elasticsearch.common.io.stream.StreamOutput;
 import org.elasticsearch.common.xcontent.ConstructingObjectParser;
 import org.elasticsearch.common.xcontent.XContentBuilder;
 import org.elasticsearch.common.xcontent.XContentParser;
-import org.elasticsearch.xpack.core.dataframe.DataFrameField;
 import org.elasticsearch.xpack.core.indexing.IndexerJobStats;
 
 import java.io.IOException;
 import java.util.Objects;
 
 import static org.elasticsearch.common.xcontent.ConstructingObjectParser.constructorArg;
-import static org.elasticsearch.common.xcontent.ConstructingObjectParser.optionalConstructorArg;
 
 public class DataFrameIndexerTransformStats extends IndexerJobStats {
-    public static final String DEFAULT_TRANSFORM_ID = "_all";
+
+    private static final String DEFAULT_TRANSFORM_ID = "_all";  // TODO remove when no longer needed for wire BWC
 
     public static final String NAME = "data_frame_indexer_transform_stats";
     public static ParseField NUM_PAGES = new ParseField("pages_processed");
@@ -39,12 +38,11 @@ public class DataFrameIndexerTransformStats extends IndexerJobStats {
 
     private static final ConstructingObjectParser<DataFrameIndexerTransformStats, Void> LENIENT_PARSER = new ConstructingObjectParser<>(
             NAME, true,
-            args -> new DataFrameIndexerTransformStats(args[0] != null ? (String) args[0] : DEFAULT_TRANSFORM_ID,
-                    (long) args[1], (long) args[2], (long) args[3], (long) args[4], (long) args[5], (long) args[6], (long) args[7],
-                    (long) args[8], (long) args[9], (long) args[10]));
+            args -> new DataFrameIndexerTransformStats(
+                    (long) args[0], (long) args[1], (long) args[2], (long) args[3], (long) args[4], (long) args[5], (long) args[6],
+                    (long) args[7], (long) args[8], (long) args[9]));
 
     static {
-        LENIENT_PARSER.declareString(optionalConstructorArg(), DataFrameField.ID);
         LENIENT_PARSER.declareLong(constructorArg(), NUM_PAGES);
         LENIENT_PARSER.declareLong(constructorArg(), NUM_INPUT_DOCUMENTS);
         LENIENT_PARSER.declareLong(constructorArg(), NUM_OUTPUT_DOCUMENTS);
@@ -57,60 +55,38 @@ public class DataFrameIndexerTransformStats extends IndexerJobStats {
         LENIENT_PARSER.declareLong(constructorArg(), SEARCH_FAILURES);
     }
 
-    private final String transformId;
-
     /**
-     * Certain situations call for a default transform ID, e.g. when merging many different transforms for statistics gather.
-     *
-     * The returned stats object cannot be stored in the index as the transformId does not refer to a real transform configuration
-     *
-     * @return new DataFrameIndexerTransformStats with empty stats and a default transform ID
+     * Create with all stats set to zero
      */
-    public static DataFrameIndexerTransformStats withDefaultTransformId() {
-        return new DataFrameIndexerTransformStats(DEFAULT_TRANSFORM_ID);
-    }
-
-    public static DataFrameIndexerTransformStats withDefaultTransformId(long numPages, long numInputDocuments, long numOutputDocuments,
-                                                                        long numInvocations, long indexTime, long searchTime,
-                                                                        long indexTotal, long searchTotal, long indexFailures,
-                                                                        long searchFailures) {
-        return new DataFrameIndexerTransformStats(DEFAULT_TRANSFORM_ID, numPages, numInputDocuments,
-            numOutputDocuments, numInvocations, indexTime, searchTime, indexTotal, searchTotal,
-            indexFailures, searchFailures);
-    }
-
-    public DataFrameIndexerTransformStats(String transformId) {
+    public DataFrameIndexerTransformStats() {
         super();
-        this.transformId = Objects.requireNonNull(transformId, "parameter transformId must not be null");
     }
 
-    public DataFrameIndexerTransformStats(String transformId, long numPages, long numInputDocuments, long numOutputDocuments,
+    public DataFrameIndexerTransformStats(long numPages, long numInputDocuments, long numOutputDocuments,
                                           long numInvocations, long indexTime, long searchTime, long indexTotal, long searchTotal,
                                           long indexFailures, long searchFailures) {
         super(numPages, numInputDocuments, numOutputDocuments, numInvocations, indexTime, searchTime, indexTotal, searchTotal,
             indexFailures, searchFailures);
-        this.transformId = Objects.requireNonNull(transformId, "parameter transformId must not be null");
     }
 
     public DataFrameIndexerTransformStats(DataFrameIndexerTransformStats other) {
-        this(other.transformId, other.numPages, other.numInputDocuments, other.numOuputDocuments, other.numInvocations,
+        this(other.numPages, other.numInputDocuments, other.numOuputDocuments, other.numInvocations,
             other.indexTime, other.searchTime, other.indexTotal, other.searchTotal, other.indexFailures, other.searchFailures);
     }
 
     public DataFrameIndexerTransformStats(StreamInput in) throws IOException {
         super(in);
-        transformId = in.readString();
+        if (in.getVersion().before(Version.V_7_4_0)) {
+            in.readString(); // was transformId
+        }
     }
 
     @Override
     public void writeTo(StreamOutput out) throws IOException {
         super.writeTo(out);
-        out.writeString(transformId);
-    }
-
-    @Nullable
-    public String getTransformId() {
-        return transformId;
+        if (out.getVersion().before(Version.V_7_4_0)) {
+            out.writeString(DEFAULT_TRANSFORM_ID);
+        }
     }
 
     @Override
@@ -126,21 +102,11 @@ public XContentBuilder toXContent(XContentBuilder builder, Params params) throws
         builder.field(SEARCH_TIME_IN_MS.getPreferredName(), searchTime);
         builder.field(SEARCH_TOTAL.getPreferredName(), searchTotal);
         builder.field(SEARCH_FAILURES.getPreferredName(), searchFailures);
-        if (params.paramAsBoolean(DataFrameField.FOR_INTERNAL_STORAGE, false)) {
-            // If we are storing something, it should have a valid transform ID.
-            if (transformId.equals(DEFAULT_TRANSFORM_ID)) {
-                throw new IllegalArgumentException("when storing transform statistics, a valid transform id must be provided");
-            }
-            builder.field(DataFrameField.ID.getPreferredName(), transformId);
-        }
         builder.endObject();
         return builder;
     }
 
     public DataFrameIndexerTransformStats merge(DataFrameIndexerTransformStats other) {
-        // We should probably not merge two sets of stats unless one is an accumulation object (i.e. with the default transform id)
-        // or the stats are referencing the same transform
-        assert transformId.equals(DEFAULT_TRANSFORM_ID) || this.transformId.equals(other.transformId);
         numPages += other.numPages;
         numInputDocuments += other.numInputDocuments;
         numOuputDocuments += other.numOuputDocuments;
@@ -167,8 +133,7 @@ public boolean equals(Object other) {
 
         DataFrameIndexerTransformStats that = (DataFrameIndexerTransformStats) other;
 
-        return Objects.equals(this.transformId, that.transformId)
-            && Objects.equals(this.numPages, that.numPages)
+        return Objects.equals(this.numPages, that.numPages)
             && Objects.equals(this.numInputDocuments, that.numInputDocuments)
             && Objects.equals(this.numOuputDocuments, that.numOuputDocuments)
             && Objects.equals(this.numInvocations, that.numInvocations)
@@ -182,7 +147,7 @@ public boolean equals(Object other) {
 
     @Override
     public int hashCode() {
-        return Objects.hash(transformId, numPages, numInputDocuments, numOuputDocuments, numInvocations,
+        return Objects.hash(numPages, numInputDocuments, numOuputDocuments, numInvocations,
             indexTime, searchTime, indexFailures, searchFailures, indexTotal, searchTotal);
     }
 

x-pack/plugin/core/src/main/java/org/elasticsearch/xpack/core/dataframe/transforms/DataFrameTransformStats.java

@@ -75,7 +75,7 @@ public static DataFrameTransformStats fromXContent(XContentParser parser) throws
     }
 
     public static DataFrameTransformStats initialStats(String id) {
-        return stoppedStats(id, new DataFrameIndexerTransformStats(id));
+        return stoppedStats(id, new DataFrameIndexerTransformStats());
     }
 
     public static DataFrameTransformStats stoppedStats(String id, DataFrameIndexerTransformStats indexerTransformStats) {

x-pack/plugin/core/src/test/java/org/elasticsearch/xpack/core/dataframe/transforms/DataFrameIndexerTransformStatsTests.java

@@ -7,19 +7,13 @@
 package org.elasticsearch.xpack.core.dataframe.transforms;
 
 import org.elasticsearch.common.io.stream.Writeable;
-import org.elasticsearch.common.xcontent.ToXContent;
 import org.elasticsearch.common.xcontent.XContentParser;
 import org.elasticsearch.test.AbstractSerializingTestCase;
-import org.elasticsearch.xpack.core.dataframe.DataFrameField;
 
 import java.io.IOException;
-import java.util.Collections;
 
 public class DataFrameIndexerTransformStatsTests extends AbstractSerializingTestCase<DataFrameIndexerTransformStats> {
 
-    protected static ToXContent.Params TO_XCONTENT_PARAMS = new ToXContent.MapParams(
-        Collections.singletonMap(DataFrameField.FOR_INTERNAL_STORAGE, "true"));
-
     @Override
     protected DataFrameIndexerTransformStats createTestInstance() {
         return randomStats();
@@ -36,36 +30,26 @@ protected DataFrameIndexerTransformStats doParseInstance(XContentParser parser)
     }
 
     public static DataFrameIndexerTransformStats randomStats() {
-        return randomStats(randomAlphaOfLength(10));
-    }
-
-    public static DataFrameIndexerTransformStats randomStats(String transformId) {
-        return new DataFrameIndexerTransformStats(transformId, randomLongBetween(10L, 10000L),
+        return new DataFrameIndexerTransformStats(randomLongBetween(10L, 10000L),
             randomLongBetween(0L, 10000L), randomLongBetween(0L, 10000L), randomLongBetween(0L, 10000L), randomLongBetween(0L, 10000L),
             randomLongBetween(0L, 10000L), randomLongBetween(0L, 10000L), randomLongBetween(0L, 10000L), randomLongBetween(0L, 10000L),
             randomLongBetween(0L, 10000L));
     }
 
-    @Override
-    protected ToXContent.Params getToXContentParams() {
-        return TO_XCONTENT_PARAMS;
-    }
-
     public void testMerge() throws IOException {
-        String transformId = randomAlphaOfLength(10);
-        DataFrameIndexerTransformStats emptyStats = new DataFrameIndexerTransformStats(transformId);
-        DataFrameIndexerTransformStats randomStats = randomStats(transformId);
+        DataFrameIndexerTransformStats emptyStats = new DataFrameIndexerTransformStats();
+        DataFrameIndexerTransformStats randomStats = randomStats();
 
         assertEquals(randomStats, emptyStats.merge(randomStats));
         assertEquals(randomStats, randomStats.merge(emptyStats));
 
         DataFrameIndexerTransformStats randomStatsClone = copyInstance(randomStats);
 
-        DataFrameIndexerTransformStats trippleRandomStats = new DataFrameIndexerTransformStats(transformId, 3 * randomStats.getNumPages(),
+        DataFrameIndexerTransformStats tripleRandomStats = new DataFrameIndexerTransformStats(3 * randomStats.getNumPages(),
                 3 * randomStats.getNumDocuments(), 3 * randomStats.getOutputDocuments(), 3 * randomStats.getNumInvocations(),
                 3 * randomStats.getIndexTime(), 3 * randomStats.getSearchTime(), 3 * randomStats.getIndexTotal(),
                 3 * randomStats.getSearchTotal(), 3 * randomStats.getIndexFailures(), 3 * randomStats.getSearchFailures());
 
-        assertEquals(trippleRandomStats, randomStats.merge(randomStatsClone).merge(randomStatsClone));
+        assertEquals(tripleRandomStats, randomStats.merge(randomStatsClone).merge(randomStatsClone));
     }
 }

x-pack/plugin/core/src/test/java/org/elasticsearch/xpack/core/dataframe/transforms/DataFrameTransformStatsTests.java

@@ -20,7 +20,7 @@ public static DataFrameTransformStats randomDataFrameTransformStats() {
             randomFrom(DataFrameTransformTaskState.values()),
             randomBoolean() ? null : randomAlphaOfLength(100),
             randomBoolean() ? null : NodeAttributeTests.randomNodeAttributes(),
-            DataFrameIndexerTransformStatsTests.randomStats(DataFrameIndexerTransformStats.DEFAULT_TRANSFORM_ID),
+            DataFrameIndexerTransformStatsTests.randomStats(),
             DataFrameTransformCheckpointingInfoTests.randomDataFrameTransformCheckpointingInfo());
     }
 

x-pack/plugin/core/src/test/java/org/elasticsearch/xpack/core/dataframe/transforms/DataFrameTransformStoredDocTests.java

@@ -22,7 +22,7 @@ public class DataFrameTransformStoredDocTests extends AbstractSerializingDataFra
     public static DataFrameTransformStoredDoc randomDataFrameTransformStoredDoc(String id) {
         return new DataFrameTransformStoredDoc(id,
                 DataFrameTransformStateTests.randomDataFrameTransformState(),
-                DataFrameIndexerTransformStatsTests.randomStats(id));
+                DataFrameIndexerTransformStatsTests.randomStats());
     }
 
     public static DataFrameTransformStoredDoc randomDataFrameTransformStoredDoc() {

x-pack/plugin/data-frame/src/main/java/org/elasticsearch/xpack/dataframe/DataFrameFeatureSet.java

@@ -105,7 +105,7 @@ public void usage(ActionListener<XPackFeatureSet.Usage> listener) {
             listener.onResponse(new DataFrameFeatureSetUsage(available(),
                 enabled(),
                 Collections.emptyMap(),
-                DataFrameIndexerTransformStats.withDefaultTransformId()));
+                new DataFrameIndexerTransformStats()));
             return;
         }
 
@@ -139,7 +139,7 @@ public void usage(ActionListener<XPackFeatureSet.Usage> listener) {
                     listener.onResponse(new DataFrameFeatureSetUsage(available(),
                         enabled(),
                         transformsCountByState,
-                        DataFrameIndexerTransformStats.withDefaultTransformId()));
+                        new DataFrameIndexerTransformStats()));
                     return;
                 }
                 transformsCountByState.merge(DataFrameTransformTaskState.STOPPED.value(), totalTransforms - taskCount, Long::sum);
@@ -179,7 +179,7 @@ static DataFrameIndexerTransformStats parseSearchAggs(SearchResponse searchRespo
                 statisticsList.add(0L);
             }
         }
-        return DataFrameIndexerTransformStats.withDefaultTransformId(statisticsList.get(0),  // numPages
+        return new DataFrameIndexerTransformStats(statisticsList.get(0),  // numPages
             statisticsList.get(1),  // numInputDocuments
             statisticsList.get(2),  // numOutputDocuments
             statisticsList.get(3),  // numInvocations
@@ -216,7 +216,7 @@ static void getStatisticSummations(Client client, ActionListener<DataFrameIndexe
             },
             failure -> {
                 if (failure instanceof ResourceNotFoundException) {
-                    statsListener.onResponse(DataFrameIndexerTransformStats.withDefaultTransformId());
+                    statsListener.onResponse(new DataFrameIndexerTransformStats());
                 } else {
                     statsListener.onFailure(failure);
                 }

x-pack/plugin/data-frame/src/main/java/org/elasticsearch/xpack/dataframe/action/TransportPreviewDataFrameTransformAction.java

@@ -144,7 +144,7 @@ private void getPreview(Pivot pivot,
                         r -> {
                             try {
                                 final CompositeAggregation agg = r.getAggregations().get(COMPOSITE_AGGREGATION_NAME);
-                                DataFrameIndexerTransformStats stats = DataFrameIndexerTransformStats.withDefaultTransformId();
+                                DataFrameIndexerTransformStats stats = new DataFrameIndexerTransformStats();
                                 // remove all internal fields
 
                                 if (pipeline == null) {

x-pack/plugin/data-frame/src/main/java/org/elasticsearch/xpack/dataframe/transforms/DataFrameTransformTask.java

@@ -166,7 +166,7 @@ public DataFrameTransformState getState() {
 
     public DataFrameIndexerTransformStats getStats() {
         if (getIndexer() == null) {
-            return new DataFrameIndexerTransformStats(getTransformId());
+            return new DataFrameIndexerTransformStats();
         } else {
             return getIndexer().getStats();
         }
@@ -425,7 +425,7 @@ static class ClientDataFrameIndexerBuilder {
 
         ClientDataFrameIndexerBuilder(String transformId) {
             this.transformId = transformId;
-            this.initialStats = new DataFrameIndexerTransformStats(transformId);
+            this.initialStats = new DataFrameIndexerTransformStats();
         }
 
         ClientDataFrameIndexer build(DataFrameTransformTask parentTask) {
@@ -551,7 +551,7 @@ static class ClientDataFrameIndexer extends DataFrameIndexer {
                 fieldMappings,
                 ExceptionsHelper.requireNonNull(initialState, "initialState"),
                 initialPosition,
-                initialStats == null ? new DataFrameIndexerTransformStats(transformId) : initialStats,
+                initialStats == null ? new DataFrameIndexerTransformStats() : initialStats,
                 transformProgress,
                 lastCheckpoint,
                 nextCheckpoint);