Add exact vector search option.

driver-core/src/main/com/mongodb/client/model/Aggregates.java

@@ -52,7 +52,6 @@
 import static com.mongodb.client.model.GeoNearOptions.geoNearOptions;
 import static com.mongodb.client.model.densify.DensifyOptions.densifyOptions;
 import static com.mongodb.client.model.search.SearchOptions.searchOptions;
-import static com.mongodb.client.model.search.VectorSearchOptions.vectorSearchOptions;
 import static com.mongodb.internal.Iterables.concat;
 import static com.mongodb.internal.client.model.Util.sizeAtLeast;
 import static java.util.Arrays.asList;
@@ -947,35 +946,6 @@ public static Bson searchMeta(final SearchCollector collector, final SearchOptio
      * @param queryVector The query vector. The number of dimensions must match that of the {@code index}.
      * @param path The field to be searched.
      * @param index The name of the index to use.
-     * @param numCandidates The number of candidates.
-     * @param limit The limit on the number of documents produced by the pipeline stage.
-     * @return The {@code $vectorSearch} pipeline stage.
-     *
-     * @mongodb.atlas.manual atlas-vector-search/vector-search-stage/ $vectorSearch
-     * @mongodb.atlas.manual atlas-search/scoring/ Scoring
-     * @mongodb.server.release 6.0.10
-     * @since 4.11
-     */
-    @Beta(Reason.SERVER)
-    public static Bson vectorSearch(
-            final FieldSearchPath path,
-            final Iterable<Double> queryVector,
-            final String index,
-            final long numCandidates,
-            final long limit) {
-        return vectorSearch(notNull("path", path), notNull("queryVector", queryVector), notNull("index", index), numCandidates, limit,
-                vectorSearchOptions());
-    }
-
-    /**
-     * Creates a {@code $vectorSearch} pipeline stage supported by MongoDB Atlas.
-     * You may use the {@code $meta: "vectorSearchScore"} expression, e.g., via {@link Projections#metaVectorSearchScore(String)},
-     * to extract the relevance score assigned to each found document.
-     *
-     * @param queryVector The query vector. The number of dimensions must match that of the {@code index}.
-     * @param path The field to be searched.
-     * @param index The name of the index to use.
-     * @param numCandidates The number of candidates.
      * @param limit The limit on the number of documents produced by the pipeline stage.
      * @param options Optional {@code $vectorSearch} pipeline stage fields.
      * @return The {@code $vectorSearch} pipeline stage.
@@ -990,7 +960,6 @@ public static Bson vectorSearch(
             final FieldSearchPath path,
             final Iterable<Double> queryVector,
             final String index,
-            final long numCandidates,
             final long limit,
             final VectorSearchOptions options) {
         notNull("path", path);
@@ -1003,7 +972,6 @@ public <TDocument> BsonDocument toBsonDocument(final Class<TDocument> documentCl
                 Document specificationDoc = new Document("path", path.toValue())
                         .append("queryVector", queryVector)
                         .append("index", index)
-                        .append("numCandidates", numCandidates)
                         .append("limit", limit);
                 specificationDoc.putAll(options.toBsonDocument(documentClass, codecRegistry));
                 return new Document("$vectorSearch", specificationDoc).toBsonDocument(documentClass, codecRegistry);
@@ -1015,7 +983,6 @@ public String toString() {
                         + ", path=" + path
                         + ", queryVector=" + queryVector
                         + ", index=" + index
-                        + ", numCandidates=" + numCandidates
                         + ", limit=" + limit
                         + ", options=" + options
                         + '}';

driver-core/src/main/com/mongodb/client/model/Projections.java

@@ -215,7 +215,7 @@ public static Bson metaSearchScore(final String fieldName) {
 
     /**
      * Creates a projection to the given field name of the vectorSearchScore,
-     * for use with {@link Aggregates#vectorSearch(FieldSearchPath, Iterable, String, long, long, VectorSearchOptions)}.
+     * for use with {@link Aggregates#vectorSearch(FieldSearchPath, Iterable, String, long, VectorSearchOptions)} .
      * Calling this method is equivalent to calling {@link #meta(String, String)} with {@code "vectorSearchScore"} as the second argument.
      *
      * @param fieldName the field name

driver-core/src/main/com/mongodb/client/model/search/ApproximateVectorSearchOptions.java

@@ -0,0 +1,37 @@
+/*
+ * Copyright 2008-present MongoDB, Inc.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.mongodb.client.model.search;
+
+import com.mongodb.annotations.Beta;
+import com.mongodb.annotations.Reason;
+import com.mongodb.annotations.Sealed;
+import com.mongodb.client.model.Aggregates;
+
+/**
+ * Represents optional fields of the {@code $vectorSearch} pipeline stage of an aggregation pipeline.
+ * <p>
+ * Configures approximate vector search for Atlas Vector Search to enable searches that may not return the exact closest vectors.
+ *
+ * @see Aggregates#vectorSearch(FieldSearchPath, Iterable, String, long, VectorSearchOptions)
+ * @mongodb.atlas.manual atlas-vector-search/vector-search-stage/ $vectorSearch
+ * @mongodb.server.release 6.0.10
+ * @since 5.2
+ */
+@Sealed
+@Beta(Reason.SERVER)
+public interface ApproximateVectorSearchOptions extends VectorSearchOptions {
+}

driver-core/src/main/com/mongodb/client/model/search/ExactVectorSearchOptions.java

@@ -0,0 +1,37 @@
+/*
+ * Copyright 2008-present MongoDB, Inc.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.mongodb.client.model.search;
+
+import com.mongodb.annotations.Beta;
+import com.mongodb.annotations.Reason;
+import com.mongodb.annotations.Sealed;
+import com.mongodb.client.model.Aggregates;
+
+/**
+ * Represents optional fields of the {@code $vectorSearch} pipeline stage of an aggregation pipeline.
+ * <p>
+ * Configures exact vector search for Atlas Vector Search to enable precise matching, ensuring that
+ * results are the closest vectors to a given query vector.
+ *
+ * @see Aggregates#vectorSearch(FieldSearchPath, Iterable, String, long, VectorSearchOptions)
+ * @mongodb.atlas.manual atlas-vector-search/vector-search-stage/ $vectorSearch
+ * @since 5.2
+ */
+@Sealed
+@Beta(Reason.SERVER)
+public interface ExactVectorSearchOptions extends VectorSearchOptions {
+}

driver-core/src/main/com/mongodb/client/model/search/VectorSearchConstructibleBson.java

@@ -23,7 +23,8 @@
 
 import static com.mongodb.assertions.Assertions.notNull;
 
-final class VectorSearchConstructibleBson extends AbstractConstructibleBson<VectorSearchConstructibleBson> implements VectorSearchOptions {
+final class VectorSearchConstructibleBson extends AbstractConstructibleBson<VectorSearchConstructibleBson>
+        implements ApproximateVectorSearchOptions, ExactVectorSearchOptions {
     /**
      * An {@linkplain Immutable immutable} {@link BsonDocument#isEmpty() empty} instance.
      */

driver-core/src/main/com/mongodb/client/model/search/VectorSearchOptions.java

@@ -25,7 +25,7 @@
 /**
  * Represents optional fields of the {@code $vectorSearch} pipeline stage of an aggregation pipeline.
  *
- * @see Aggregates#vectorSearch(FieldSearchPath, Iterable, String, long, long, VectorSearchOptions)
+ * @see Aggregates#vectorSearch(FieldSearchPath, Iterable, String, long, VectorSearchOptions)
  * @mongodb.atlas.manual atlas-vector-search/vector-search-stage/ $vectorSearch
  * @mongodb.server.release 6.0.10
  * @since 4.11
@@ -37,7 +37,7 @@ public interface VectorSearchOptions extends Bson {
      * Creates a new {@link VectorSearchOptions} with the filter specified.
      *
      * @param filter A filter that is applied before applying the
-     * {@link Aggregates#vectorSearch(FieldSearchPath, Iterable, String, long, long, VectorSearchOptions) queryVector}.
+     * {@link Aggregates#vectorSearch(FieldSearchPath, Iterable, String, long, VectorSearchOptions) queryVector}
      * One may use {@link Filters} to create this filter, though not all filters may be supported.
      * See the MongoDB documentation for the list of supported filters.
      * @return A new {@link VectorSearchOptions}.
@@ -66,11 +66,24 @@ public interface VectorSearchOptions extends Bson {
     VectorSearchOptions option(String name, Object value);
 
     /**
-     * Returns {@link VectorSearchOptions} that represents server defaults.
+     * Returns {@link ApproximateVectorSearchOptions} that represents server defaults.
      *
-     * @return {@link VectorSearchOptions} that represents server defaults.
+     * @param numCandidates The number of candidates.
+     * @return {@link ApproximateVectorSearchOptions} that represents server defaults.
+     * @since 5.2
      */
-    static VectorSearchOptions vectorSearchOptions() {
-        return VectorSearchConstructibleBson.EMPTY_IMMUTABLE;
+    static ApproximateVectorSearchOptions approximateVectorSearchOptions(long numCandidates) {
+        return (ApproximateVectorSearchOptions) VectorSearchConstructibleBson.EMPTY_IMMUTABLE.option("numCandidates", numCandidates);
+    }
+
+    /**
+     * Returns {@link ExactVectorSearchOptions} that represents server defaults with the {@code exact} option set to true.
+     *
+     * @return {@link ExactVectorSearchOptions} that represents server defaults.
+     * @since 5.2
+     */
+    static ExactVectorSearchOptions exactVectorSearchOptions() {
+        return (ExactVectorSearchOptions) VectorSearchConstructibleBson.EMPTY_IMMUTABLE
+                .option("exact", true);
     }
 }

driver-core/src/main/com/mongodb/client/model/search/package-info.java

@@ -25,7 +25,8 @@
  *
  * @see com.mongodb.client.model.Aggregates#search(SearchOperator, SearchOptions)
  * @see com.mongodb.client.model.Aggregates#search(SearchCollector, SearchOptions)
- * @see com.mongodb.client.model.Aggregates#vectorSearch(FieldSearchPath, java.lang.Iterable, java.lang.String, long, long, VectorSearchOptions)
+ * @see com.mongodb.client.model.Aggregates#vectorSearch(com.mongodb.client.model.search.FieldSearchPath, java.lang.Iterable, java.lang.String,
+ * long, com.mongodb.client.model.search.VectorSearchOptions)
  * @mongodb.atlas.manual atlas-search/ Atlas Search
  * @mongodb.atlas.manual atlas-search/query-syntax/ Atlas Search aggregation pipeline stages
  * @since 4.7

driver-core/src/test/unit/com/mongodb/client/model/AggregatesSpecification.groovy

@@ -98,7 +98,8 @@ import static com.mongodb.client.model.search.SearchOperator.exists
 import static com.mongodb.client.model.search.SearchOptions.searchOptions
 import static com.mongodb.client.model.search.SearchPath.fieldPath
 import static com.mongodb.client.model.search.SearchPath.wildcardPath
-import static com.mongodb.client.model.search.VectorSearchOptions.vectorSearchOptions
+import static com.mongodb.client.model.search.VectorSearchOptions.approximateVectorSearchOptions
+import static com.mongodb.client.model.search.VectorSearchOptions.exactVectorSearchOptions
 import static java.util.Arrays.asList
 import static org.bson.BsonDocument.parse
 
@@ -849,16 +850,15 @@ class AggregatesSpecification extends Specification {
         }''')
     }
 
-    def 'should render $vectorSearch'() {
+    def 'should render approximate $vectorSearch'() {
         when:
         BsonDocument vectorSearchDoc = toBson(
                 vectorSearch(
                         fieldPath('fieldName').multi('ignored'),
                         [1.0d, 2.0d],
                         'indexName',
-                        2,
                         1,
-                        vectorSearchOptions()
+                        approximateVectorSearchOptions(2)
                                 .filter(Filters.ne("fieldName", "fieldValue"))
 
                 )
@@ -877,15 +877,17 @@ class AggregatesSpecification extends Specification {
         }''')
     }
 
-    def 'should render $vectorSearch with no options'() {
+    def 'should render exact $vectorSearch'() {
         when:
         BsonDocument vectorSearchDoc = toBson(
                 vectorSearch(
-                        fieldPath('fieldName'),
+                        fieldPath('fieldName').multi('ignored'),
                         [1.0d, 2.0d],
                         'indexName',
-                        2,
-                        1
+                        1,
+                        exactVectorSearchOptions()
+                                .filter(Filters.ne("fieldName", "fieldValue"))
+
                 )
         )
 
@@ -895,8 +897,9 @@ class AggregatesSpecification extends Specification {
                     "path": "fieldName",
                     "queryVector": [1.0, 2.0],
                     "index": "indexName",
-                    "numCandidates": {"$numberLong": "2"},
-                    "limit": {"$numberLong": "1"}
+                    "exact": true,
+                    "limit": {"$numberLong": "1"},
+                    "filter": {"fieldName": {"$ne": "fieldValue"}}
                 }
         }''')
     }