Adds rescore parameter in neural search

This is required to enable rescoring for on disk mode indices

Signed-off-by: Tejas Shah <shatejas@amazon.com>

CHANGELOG.md

@@ -16,6 +16,7 @@ The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
 ## [Unreleased 2.x](https://github.com/opensearch-project/neural-search/compare/2.16...2.x)
 ### Features
 ### Enhancements
+- Adds rescore parameter support ([#885](https://github.com/opensearch-project/neural-search/pull/885)) 
 ### Bug Fixes
 - Fixed merge logic in hybrid query for multiple shards case ([#877](https://github.com/opensearch-project/neural-search/pull/877))
 ### Infrastructure

qa/restart-upgrade/src/test/java/org/opensearch/neuralsearch/bwc/HybridSearchIT.java

@@ -18,6 +18,8 @@
 import static org.opensearch.neuralsearch.util.TestUtils.TEXT_EMBEDDING_PROCESSOR;
 import static org.opensearch.neuralsearch.util.TestUtils.DEFAULT_NORMALIZATION_METHOD;
 import static org.opensearch.neuralsearch.util.TestUtils.DEFAULT_COMBINATION_METHOD;
+
+import org.opensearch.knn.index.query.rescore.RescoreContext;
 import org.opensearch.neuralsearch.query.HybridQueryBuilder;
 import org.opensearch.neuralsearch.query.NeuralQueryBuilder;
 
@@ -69,8 +71,10 @@ private void validateNormalizationProcessor(final String fileName, final String
                 modelId = getModelId(getIngestionPipeline(pipelineName), TEXT_EMBEDDING_PROCESSOR);
                 loadModel(modelId);
                 addDocuments(getIndexNameForTest(), false);
-                validateTestIndex(modelId, getIndexNameForTest(), searchPipelineName);
-                validateTestIndex(modelId, getIndexNameForTest(), searchPipelineName, Map.of("ef_search", 100));
+                HybridQueryBuilder hybridQueryBuilder = getQueryBuilder(modelId, null, null);
+                validateTestIndex(getIndexNameForTest(), searchPipelineName, hybridQueryBuilder);
+                hybridQueryBuilder = getQueryBuilder(modelId, Map.of("ef_search", 100), RescoreContext.getDefault());
+                validateTestIndex(getIndexNameForTest(), searchPipelineName, hybridQueryBuilder);
             } finally {
                 wipeOfTestResources(getIndexNameForTest(), pipelineName, modelId, searchPipelineName);
             }
@@ -98,15 +102,10 @@ private void createSearchPipeline(final String pipelineName) {
         );
     }
 
-    private void validateTestIndex(final String modelId, final String index, final String searchPipeline) {
-        validateTestIndex(modelId, index, searchPipeline, null);
-    }
-
-    private void validateTestIndex(final String modelId, final String index, final String searchPipeline, Map<String, ?> methodParameters) {
+    private void validateTestIndex(final String index, final String searchPipeline, HybridQueryBuilder queryBuilder) {
         int docCount = getDocCount(index);
         assertEquals(6, docCount);
-        HybridQueryBuilder hybridQueryBuilder = getQueryBuilder(modelId, methodParameters);
-        Map<String, Object> searchResponseAsMap = search(index, hybridQueryBuilder, null, 1, Map.of("search_pipeline", searchPipeline));
+        Map<String, Object> searchResponseAsMap = search(index, queryBuilder, null, 1, Map.of("search_pipeline", searchPipeline));
         assertNotNull(searchResponseAsMap);
         int hits = getHitCount(searchResponseAsMap);
         assertEquals(1, hits);
@@ -116,7 +115,7 @@ private void validateTestIndex(final String modelId, final String index, final S
         }
     }
 
-    private HybridQueryBuilder getQueryBuilder(final String modelId, Map<String, ?> methodParameters) {
+    private HybridQueryBuilder getQueryBuilder(final String modelId, Map<String, ?> methodParameters, RescoreContext rescoreContext) {
         NeuralQueryBuilder neuralQueryBuilder = new NeuralQueryBuilder();
         neuralQueryBuilder.fieldName("passage_embedding");
         neuralQueryBuilder.modelId(modelId);
@@ -125,6 +124,9 @@ private HybridQueryBuilder getQueryBuilder(final String modelId, Map<String, ?>
         if (methodParameters != null) {
             neuralQueryBuilder.methodParameters(methodParameters);
         }
+        if (rescoreContext != null) {
+            neuralQueryBuilder.rescoreContext(rescoreContext);
+        }
 
         MatchQueryBuilder matchQueryBuilder = new MatchQueryBuilder("text", QUERY);
 

qa/restart-upgrade/src/test/java/org/opensearch/neuralsearch/bwc/KnnRadialSearchIT.java

@@ -61,6 +61,7 @@ private void validateIndexQuery(final String modelId) {
             0.01f,
             null,
             null,
+            null,
             null
         );
         Map<String, Object> responseWithMinScoreQuery = search(getIndexNameForTest(), neuralQueryBuilderWithMinScoreQuery, 1);
@@ -76,6 +77,7 @@ private void validateIndexQuery(final String modelId) {
             null,
             null,
             null,
+            null,
             null
         );
         Map<String, Object> responseWithMaxDistanceQuery = search(getIndexNameForTest(), neuralQueryBuilderWithMaxDistanceQuery, 1);

qa/restart-upgrade/src/test/java/org/opensearch/neuralsearch/bwc/MultiModalSearchIT.java

@@ -63,6 +63,7 @@ private void validateTestIndex(final String modelId) throws Exception {
             null,
             null,
             null,
+            null,
             null
         );
         Map<String, Object> response = search(getIndexNameForTest(), neuralQueryBuilder, 1);

qa/rolling-upgrade/src/test/java/org/opensearch/neuralsearch/bwc/HybridSearchIT.java

@@ -16,6 +16,8 @@
 import static org.opensearch.neuralsearch.util.TestUtils.DEFAULT_NORMALIZATION_METHOD;
 import static org.opensearch.neuralsearch.util.TestUtils.DEFAULT_COMBINATION_METHOD;
 import static org.opensearch.neuralsearch.util.TestUtils.getModelId;
+
+import org.opensearch.knn.index.query.rescore.RescoreContext;
 import org.opensearch.neuralsearch.query.HybridQueryBuilder;
 import org.opensearch.neuralsearch.query.NeuralQueryBuilder;
 
@@ -59,11 +61,13 @@ public void testNormalizationProcessor_whenIndexWithMultipleShards_E2EFlow() thr
                 int totalDocsCountMixed;
                 if (isFirstMixedRound()) {
                     totalDocsCountMixed = NUM_DOCS_PER_ROUND;
-                    validateTestIndexOnUpgrade(totalDocsCountMixed, modelId);
+                    HybridQueryBuilder hybridQueryBuilder = getQueryBuilder(modelId, null, null);
+                    validateTestIndexOnUpgrade(totalDocsCountMixed, modelId, hybridQueryBuilder);
                     addDocument(getIndexNameForTest(), "1", TEST_FIELD, TEXT_MIXED, null, null);
                 } else {
                     totalDocsCountMixed = 2 * NUM_DOCS_PER_ROUND;
-                    validateTestIndexOnUpgrade(totalDocsCountMixed, modelId);
+                    HybridQueryBuilder hybridQueryBuilder = getQueryBuilder(modelId, null, null);
+                    validateTestIndexOnUpgrade(totalDocsCountMixed, modelId, hybridQueryBuilder);
                 }
                 break;
             case UPGRADED:
@@ -72,8 +76,10 @@ public void testNormalizationProcessor_whenIndexWithMultipleShards_E2EFlow() thr
                     int totalDocsCountUpgraded = 3 * NUM_DOCS_PER_ROUND;
                     loadModel(modelId);
                     addDocument(getIndexNameForTest(), "2", TEST_FIELD, TEXT_UPGRADED, null, null);
-                    validateTestIndexOnUpgrade(totalDocsCountUpgraded, modelId);
-                    validateTestIndexOnUpgrade(totalDocsCountUpgraded, modelId, Map.of("ef_search", 100));
+                    HybridQueryBuilder hybridQueryBuilder = getQueryBuilder(modelId, null, null);
+                    validateTestIndexOnUpgrade(totalDocsCountUpgraded, modelId, hybridQueryBuilder);
+                    hybridQueryBuilder = getQueryBuilder(modelId, Map.of("ef_search", 100), RescoreContext.getDefault());
+                    validateTestIndexOnUpgrade(totalDocsCountUpgraded, modelId, hybridQueryBuilder);
                 } finally {
                     wipeOfTestResources(getIndexNameForTest(), PIPELINE_NAME, modelId, SEARCH_PIPELINE_NAME);
                 }
@@ -83,16 +89,11 @@ public void testNormalizationProcessor_whenIndexWithMultipleShards_E2EFlow() thr
         }
     }
 
-    private void validateTestIndexOnUpgrade(final int numberOfDocs, final String modelId) throws Exception {
-        validateTestIndexOnUpgrade(numberOfDocs, modelId, null);
-    }
-
-    private void validateTestIndexOnUpgrade(final int numberOfDocs, final String modelId, Map<String, ?> methodParameters)
+    private void validateTestIndexOnUpgrade(final int numberOfDocs, final String modelId, HybridQueryBuilder hybridQueryBuilder)
         throws Exception {
         int docCount = getDocCount(getIndexNameForTest());
         assertEquals(numberOfDocs, docCount);
         loadModel(modelId);
-        HybridQueryBuilder hybridQueryBuilder = getQueryBuilder(modelId, methodParameters);
         Map<String, Object> searchResponseAsMap = search(
             getIndexNameForTest(),
             hybridQueryBuilder,
@@ -109,7 +110,11 @@ private void validateTestIndexOnUpgrade(final int numberOfDocs, final String mod
         }
     }
 
-    private HybridQueryBuilder getQueryBuilder(final String modelId, final Map<String, ?> methodParameters) {
+    private HybridQueryBuilder getQueryBuilder(
+        final String modelId,
+        final Map<String, ?> methodParameters,
+        final RescoreContext rescoreContext
+    ) {
         NeuralQueryBuilder neuralQueryBuilder = new NeuralQueryBuilder();
         neuralQueryBuilder.fieldName("passage_embedding");
         neuralQueryBuilder.modelId(modelId);
@@ -118,6 +123,9 @@ private HybridQueryBuilder getQueryBuilder(final String modelId, final Map<Strin
         if (methodParameters != null) {
             neuralQueryBuilder.methodParameters(methodParameters);
         }
+        if (rescoreContext != null) {
+            neuralQueryBuilder.rescoreContext(rescoreContext);
+        }
 
         MatchQueryBuilder matchQueryBuilder = new MatchQueryBuilder("text", QUERY);
 

qa/rolling-upgrade/src/test/java/org/opensearch/neuralsearch/bwc/KnnRadialSearchIT.java

@@ -87,6 +87,7 @@ private void validateIndexQueryOnUpgrade(final int numberOfDocs, final String mo
             0.01f,
             null,
             null,
+            null,
             null
         );
         Map<String, Object> responseWithMinScore = search(getIndexNameForTest(), neuralQueryBuilderWithMinScoreQuery, 1);
@@ -102,6 +103,7 @@ private void validateIndexQueryOnUpgrade(final int numberOfDocs, final String mo
             null,
             null,
             null,
+            null,
             null
         );
         Map<String, Object> responseWithMaxScore = search(getIndexNameForTest(), neuralQueryBuilderWithMaxDistanceQuery, 1);

qa/rolling-upgrade/src/test/java/org/opensearch/neuralsearch/bwc/MultiModalSearchIT.java

@@ -86,6 +86,7 @@ private void validateTestIndexOnUpgrade(final int numberOfDocs, final String mod
             null,
             null,
             null,
+            null,
             null
         );
         Map<String, Object> responseWithKQuery = search(getIndexNameForTest(), neuralQueryBuilderWithKQuery, 1);

src/main/java/org/opensearch/neuralsearch/query/NeuralQueryBuilder.java

@@ -8,6 +8,7 @@
 import static org.opensearch.knn.index.query.KNNQueryBuilder.MAX_DISTANCE_FIELD;
 import static org.opensearch.knn.index.query.KNNQueryBuilder.METHOD_PARAMS_FIELD;
 import static org.opensearch.knn.index.query.KNNQueryBuilder.MIN_SCORE_FIELD;
+import static org.opensearch.knn.index.query.KNNQueryBuilder.RESCORE_FIELD;
 import static org.opensearch.neuralsearch.common.MinClusterVersionUtil.isClusterOnOrAfterMinReqVersion;
 import static org.opensearch.neuralsearch.common.MinClusterVersionUtil.isClusterOnOrAfterMinReqVersionForDefaultModelIdSupport;
 import static org.opensearch.neuralsearch.common.MinClusterVersionUtil.isClusterOnOrAfterMinReqVersionForRadialSearch;
@@ -40,6 +41,8 @@
 import org.opensearch.index.query.QueryShardContext;
 import org.opensearch.knn.index.query.KNNQueryBuilder;
 import org.opensearch.knn.index.query.parser.MethodParametersParser;
+import org.opensearch.knn.index.query.parser.RescoreParser;
+import org.opensearch.knn.index.query.rescore.RescoreContext;
 import org.opensearch.neuralsearch.common.MinClusterVersionUtil;
 import org.opensearch.neuralsearch.ml.MLCommonsClientAccessor;
 
@@ -101,6 +104,7 @@ public static void initialize(MLCommonsClientAccessor mlClient) {
     private Supplier<float[]> vectorSupplier;
     private QueryBuilder filter;
     private Map<String, ?> methodParameters;
+    private RescoreContext rescoreContext;
 
     /**
      * Constructor from stream input
@@ -131,6 +135,7 @@ public NeuralQueryBuilder(StreamInput in) throws IOException {
         if (isClusterOnOrAfterMinReqVersion(METHOD_PARAMS_FIELD.getPreferredName())) {
             this.methodParameters = MethodParametersParser.streamInput(in, MinClusterVersionUtil::isClusterOnOrAfterMinReqVersion);
         }
+        this.rescoreContext = RescoreParser.streamInput(in);
     }
 
     @Override
@@ -156,6 +161,7 @@ protected void doWriteTo(StreamOutput out) throws IOException {
         if (isClusterOnOrAfterMinReqVersion(METHOD_PARAMS_FIELD.getPreferredName())) {
             MethodParametersParser.streamOutput(out, methodParameters, MinClusterVersionUtil::isClusterOnOrAfterMinReqVersion);
         }
+        RescoreParser.streamOutput(out, rescoreContext);
     }
 
     @Override
@@ -181,6 +187,9 @@ protected void doXContent(XContentBuilder xContentBuilder, Params params) throws
         if (Objects.nonNull(methodParameters)) {
             MethodParametersParser.doXContent(xContentBuilder, methodParameters);
         }
+        if (Objects.nonNull(rescoreContext)) {
+            RescoreParser.doXContent(xContentBuilder, rescoreContext);
+        }
         printBoostAndQueryName(xContentBuilder);
         xContentBuilder.endObject();
         xContentBuilder.endObject();
@@ -276,6 +285,8 @@ private static void parseQueryParams(XContentParser parser, NeuralQueryBuilder n
                     neuralQueryBuilder.filter(parseInnerQueryBuilder(parser));
                 } else if (METHOD_PARAMS_FIELD.match(currentFieldName, parser.getDeprecationHandler())) {
                     neuralQueryBuilder.methodParameters(MethodParametersParser.fromXContent(parser));
+                } else if (RESCORE_FIELD.match(currentFieldName, parser.getDeprecationHandler())) {
+                    neuralQueryBuilder.rescoreContext(RescoreParser.fromXContent(parser));
                 }
             } else {
                 throw new ParsingException(
@@ -308,6 +319,8 @@ protected QueryBuilder doRewrite(QueryRewriteContext queryRewriteContext) {
                 .maxDistance(maxDistance)
                 .minScore(minScore)
                 .k(k)
+                .methodParameters(methodParameters)
+                .rescoreContext(rescoreContext)
                 .build();
         }
 
@@ -335,7 +348,8 @@ protected QueryBuilder doRewrite(QueryRewriteContext queryRewriteContext) {
             minScore(),
             vectorSetOnce::get,
             filter(),
-            methodParameters()
+            methodParameters(),
+            rescoreContext()
         );
     }
 

src/test/java/org/opensearch/neuralsearch/processor/NormalizationProcessorIT.java

@@ -97,6 +97,7 @@ public void testResultProcessor_whenOneShardAndQueryMatches_thenSuccessful() {
                 null,
                 null,
                 null,
+                null,
                 null
             );
             TermQueryBuilder termQueryBuilder = QueryBuilders.termQuery(TEST_TEXT_FIELD_NAME_1, TEST_QUERY_TEXT3);
@@ -148,6 +149,7 @@ public void testResultProcessor_whenDefaultProcessorConfigAndQueryMatches_thenSu
                 null,
                 null,
                 null,
+                null,
                 null
             );
             TermQueryBuilder termQueryBuilder = QueryBuilders.termQuery(TEST_TEXT_FIELD_NAME_1, TEST_QUERY_TEXT3);
@@ -188,6 +190,7 @@ public void testQueryMatches_whenMultipleShards_thenSuccessful() {
                 null,
                 null,
                 null,
+                null,
                 null
             );
             TermQueryBuilder termQueryBuilder = QueryBuilders.termQuery(TEST_TEXT_FIELD_NAME_1, TEST_QUERY_TEXT3);

src/test/java/org/opensearch/neuralsearch/processor/ScoreCombinationIT.java

@@ -224,7 +224,7 @@ public void testHarmonicMeanCombination_whenOneShardAndQueryMatches_thenSuccessf
 
             HybridQueryBuilder hybridQueryBuilderDefaultNorm = new HybridQueryBuilder();
             hybridQueryBuilderDefaultNorm.add(
-                new NeuralQueryBuilder(TEST_KNN_VECTOR_FIELD_NAME_1, TEST_DOC_TEXT1, "", modelId, 5, null, null, null, null, null)
+                new NeuralQueryBuilder(TEST_KNN_VECTOR_FIELD_NAME_1, TEST_DOC_TEXT1, "", modelId, 5, null, null, null, null, null, null)
             );
             hybridQueryBuilderDefaultNorm.add(QueryBuilders.termQuery(TEST_TEXT_FIELD_NAME_1, TEST_QUERY_TEXT3));
 
@@ -249,7 +249,7 @@ public void testHarmonicMeanCombination_whenOneShardAndQueryMatches_thenSuccessf
 
             HybridQueryBuilder hybridQueryBuilderL2Norm = new HybridQueryBuilder();
             hybridQueryBuilderL2Norm.add(
-                new NeuralQueryBuilder(TEST_KNN_VECTOR_FIELD_NAME_1, TEST_DOC_TEXT1, "", modelId, 5, null, null, null, null, null)
+                new NeuralQueryBuilder(TEST_KNN_VECTOR_FIELD_NAME_1, TEST_DOC_TEXT1, "", modelId, 5, null, null, null, null, null, null)
             );
             hybridQueryBuilderL2Norm.add(QueryBuilders.termQuery(TEST_TEXT_FIELD_NAME_1, TEST_QUERY_TEXT3));
 
@@ -299,7 +299,7 @@ public void testGeometricMeanCombination_whenOneShardAndQueryMatches_thenSuccess
 
             HybridQueryBuilder hybridQueryBuilderDefaultNorm = new HybridQueryBuilder();
             hybridQueryBuilderDefaultNorm.add(
-                new NeuralQueryBuilder(TEST_KNN_VECTOR_FIELD_NAME_1, TEST_DOC_TEXT1, "", modelId, 5, null, null, null, null, null)
+                new NeuralQueryBuilder(TEST_KNN_VECTOR_FIELD_NAME_1, TEST_DOC_TEXT1, "", modelId, 5, null, null, null, null, null, null)
             );
             hybridQueryBuilderDefaultNorm.add(QueryBuilders.termQuery(TEST_TEXT_FIELD_NAME_1, TEST_QUERY_TEXT3));
 
@@ -324,7 +324,7 @@ public void testGeometricMeanCombination_whenOneShardAndQueryMatches_thenSuccess
 
             HybridQueryBuilder hybridQueryBuilderL2Norm = new HybridQueryBuilder();
             hybridQueryBuilderL2Norm.add(
-                new NeuralQueryBuilder(TEST_KNN_VECTOR_FIELD_NAME_1, TEST_DOC_TEXT1, "", modelId, 5, null, null, null, null, null)
+                new NeuralQueryBuilder(TEST_KNN_VECTOR_FIELD_NAME_1, TEST_DOC_TEXT1, "", modelId, 5, null, null, null, null, null, null)
             );
             hybridQueryBuilderL2Norm.add(QueryBuilders.termQuery(TEST_TEXT_FIELD_NAME_1, TEST_QUERY_TEXT3));