v6: add BM25 query

src/it/java/io/weaviate/integration/SearchITest.java

@@ -22,6 +22,7 @@
 import io.weaviate.client6.v1.api.collections.data.Reference;
 import io.weaviate.client6.v1.api.collections.query.GroupBy;
 import io.weaviate.client6.v1.api.collections.query.Metadata;
+import io.weaviate.client6.v1.api.collections.query.QueryMetadata;
 import io.weaviate.client6.v1.api.collections.query.QueryResponseGroup;
 import io.weaviate.client6.v1.api.collections.query.Where;
 import io.weaviate.client6.v1.api.collections.vectorindex.Hnsw;
@@ -255,4 +256,29 @@ public void testFetchObjectsWithFilters() throws IOException {
             hugeHat.metadata().uuid());
 
   }
+
+  @Test
+  public void testBm25() throws IOException {
+    var nsWords = ns("Words");
+
+    client.collections.create(nsWords,
+        collection -> collection
+            .properties(
+                Property.text("relevant"),
+                Property.text("irrelevant")));
+
+    var words = client.collections.use(nsWords);
+
+    /* notWant */ words.data.insert(Map.of("relevant", "elefant", "irrelevant", "dollar bill"));
+    var want = words.data.insert(Map.of("relevant", "a dime a dollar", "irrelevant", "euro"));
+
+    var dollarWorlds = words.query.bm25(
+        "dollar",
+        bm25 -> bm25.queryProperties("relevant"));
+
+    Assertions.assertThat(dollarWorlds.objects())
+        .hasSize(1)
+        .extracting(WeaviateObject::metadata).extracting(QueryMetadata::uuid)
+        .containsOnly(want.metadata().uuid());
+  }
 }

src/main/java/io/weaviate/client6/v1/api/collections/aggregate/ObjectFilter.java → src/main/java/io/weaviate/client6/v1/api/collections/aggregate/AggregateObjectFilter.java

@@ -4,13 +4,12 @@
 import io.weaviate.client6.v1.internal.grpc.protocol.WeaviateProtoAggregate.AggregateRequest.Builder;
 
 // TODO: move Near-, Hybrid, BM25 under client.collection.operators? With them implementing query.SearchOperator and aggregate.ObjectFilter
-public interface ObjectFilter {
+public interface AggregateObjectFilter {
   void appendTo(WeaviateProtoAggregate.AggregateRequest.Builder req);
 
-  static ObjectFilter NONE = new ObjectFilter() {
+  static AggregateObjectFilter NONE = new AggregateObjectFilter() {
     @Override
     public void appendTo(Builder req) {
-      return;
     }
   };
 }

src/main/java/io/weaviate/client6/v1/api/collections/aggregate/Aggregation.java

@@ -9,16 +9,16 @@
 import io.weaviate.client6.v1.internal.grpc.protocol.WeaviateProtoAggregate;
 
 public record Aggregation(
-    ObjectFilter filter,
+    AggregateObjectFilter filter,
     Integer objectLimit,
     boolean includeTotalCount,
     List<PropertyAggregation> returnMetrics) {
 
   public static Aggregation of(Function<Builder, ObjectBuilder<Aggregation>> fn) {
-    return of(ObjectFilter.NONE, fn);
+    return of(AggregateObjectFilter.NONE, fn);
   }
 
-  public static Aggregation of(ObjectFilter objectFilter, Function<Builder, ObjectBuilder<Aggregation>> fn) {
+  public static Aggregation of(AggregateObjectFilter objectFilter, Function<Builder, ObjectBuilder<Aggregation>> fn) {
     return fn.apply(new Builder(objectFilter)).build();
   }
 
@@ -31,9 +31,9 @@ public Aggregation(Builder builder) {
   }
 
   public static class Builder implements ObjectBuilder<Aggregation> {
-    private final ObjectFilter objectFilter;
+    private final AggregateObjectFilter objectFilter;
 
-    public Builder(ObjectFilter objectFilter) {
+    public Builder(AggregateObjectFilter objectFilter) {
       this.objectFilter = objectFilter;
     }
 

src/main/java/io/weaviate/client6/v1/api/collections/query/AbstractQueryClient.java

@@ -19,9 +19,9 @@ abstract class AbstractQueryClient<PropertiesT, SingleT, ResponseT, GroupedRespo
 
   protected abstract SingleT byId(ById byId);
 
-  protected abstract ResponseT performRequest(SearchOperator operator);
+  protected abstract ResponseT performRequest(QueryOperator operator);
 
-  protected abstract GroupedResponseT performRequest(SearchOperator operator, GroupBy groupBy);
+  protected abstract GroupedResponseT performRequest(QueryOperator operator, GroupBy groupBy);
 
   // Fetch by ID --------------------------------------------------------------
 
@@ -56,6 +56,32 @@ public GroupedResponseT fetchObjects(FetchObjects query, GroupBy groupBy) {
     return performRequest(query, groupBy);
   }
 
+  // BM25 queries -------------------------------------------------------------
+
+  public ResponseT bm25(String query) {
+    return bm25(Bm25.of(query));
+  }
+
+  public ResponseT bm25(String query, Function<Bm25.Builder, ObjectBuilder<Bm25>> fn) {
+    return bm25(Bm25.of(query, fn));
+  }
+
+  public ResponseT bm25(Bm25 query) {
+    return performRequest(query);
+  }
+
+  public GroupedResponseT bm25(String query, GroupBy groupBy) {
+    return bm25(Bm25.of(query), groupBy);
+  }
+
+  public GroupedResponseT bm25(String query, Function<Bm25.Builder, ObjectBuilder<Bm25>> fn, GroupBy groupBy) {
+    return bm25(Bm25.of(query, fn), groupBy);
+  }
+
+  public GroupedResponseT bm25(Bm25 query, GroupBy groupBy) {
+    return performRequest(query, groupBy);
+  }
+
   // NearVector queries -------------------------------------------------------
 
   public ResponseT nearVector(Float[] vector) {

src/main/java/io/weaviate/client6/v1/api/collections/query/Bm25.java

@@ -0,0 +1,65 @@
+package io.weaviate.client6.v1.api.collections.query;
+
+import java.util.Arrays;
+import java.util.List;
+import java.util.function.Function;
+
+import io.weaviate.client6.v1.internal.ObjectBuilder;
+import io.weaviate.client6.v1.internal.grpc.protocol.WeaviateProtoBaseSearch;
+import io.weaviate.client6.v1.internal.grpc.protocol.WeaviateProtoSearchGet;
+
+public record Bm25(String query, List<String> queryProperties, BaseQueryOptions common)
+    implements QueryOperator {
+
+  public static final Bm25 of(String query) {
+    return of(query, ObjectBuilder.identity());
+  }
+
+  public static final Bm25 of(String query, Function<Builder, ObjectBuilder<Bm25>> fn) {
+    return fn.apply(new Builder(query)).build();
+  }
+
+  public Bm25(Builder builder) {
+    this(builder.query, builder.queryProperties, builder.baseOptions());
+  }
+
+  public static class Builder extends BaseQueryOptions.Builder<Builder, Bm25> {
+    // Required query parameters.
+    private final String query;
+
+    // Optional query parameters.
+    List<String> queryProperties;
+    SearchOperator searchOperator;
+
+    public Builder(String query) {
+      this.query = query;
+    }
+
+    public Builder queryProperties(String... properties) {
+      return queryProperties(Arrays.asList(properties));
+    }
+
+    public Builder queryProperties(List<String> properties) {
+      this.queryProperties = properties;
+      return this;
+    }
+
+    public Builder searchOperator(SearchOperator searchOperator) {
+      this.searchOperator = searchOperator;
+      return this;
+    }
+
+    @Override
+    public final Bm25 build() {
+      return new Bm25(this);
+    }
+  }
+
+  @Override
+  public final void appendTo(WeaviateProtoSearchGet.SearchRequest.Builder req) {
+    common.appendTo(req);
+    req.setBm25Search(WeaviateProtoBaseSearch.BM25.newBuilder()
+        .setQuery(query)
+        .addAllProperties(queryProperties));
+  }
+}

src/main/java/io/weaviate/client6/v1/api/collections/query/ById.java

@@ -13,7 +13,7 @@ public record ById(
     String uuid,
     List<String> returnProperties,
     List<QueryReference> returnReferences,
-    List<Metadata> returnMetadata) implements SearchOperator {
+    List<Metadata> returnMetadata) implements QueryOperator {
 
   private static final String ID_PROPERTY = "_id";
 

src/main/java/io/weaviate/client6/v1/api/collections/query/FetchObjects.java

@@ -5,7 +5,7 @@
 import io.weaviate.client6.v1.internal.ObjectBuilder;
 import io.weaviate.client6.v1.internal.grpc.protocol.WeaviateProtoSearchGet;
 
-public record FetchObjects(BaseQueryOptions common) implements SearchOperator {
+public record FetchObjects(BaseQueryOptions common) implements QueryOperator {
 
   public static FetchObjects of(Function<Builder, ObjectBuilder<FetchObjects>> fn) {
     return fn.apply(new Builder()).build();

src/main/java/io/weaviate/client6/v1/api/collections/query/NearImage.java

@@ -2,14 +2,14 @@
 
 import java.util.function.Function;
 
-import io.weaviate.client6.v1.api.collections.aggregate.ObjectFilter;
+import io.weaviate.client6.v1.api.collections.aggregate.AggregateObjectFilter;
 import io.weaviate.client6.v1.internal.ObjectBuilder;
 import io.weaviate.client6.v1.internal.grpc.protocol.WeaviateProtoAggregate;
 import io.weaviate.client6.v1.internal.grpc.protocol.WeaviateProtoBaseSearch;
 import io.weaviate.client6.v1.internal.grpc.protocol.WeaviateProtoSearchGet;
 
 public record NearImage(String image, Float distance, Float certainty, BaseQueryOptions common)
-    implements SearchOperator, ObjectFilter {
+    implements QueryOperator, AggregateObjectFilter {
 
   public static NearImage of(String image) {
     return of(image, ObjectBuilder.identity());

src/main/java/io/weaviate/client6/v1/api/collections/query/NearText.java

@@ -5,14 +5,14 @@
 import java.util.List;
 import java.util.function.Function;
 
-import io.weaviate.client6.v1.api.collections.aggregate.ObjectFilter;
+import io.weaviate.client6.v1.api.collections.aggregate.AggregateObjectFilter;
 import io.weaviate.client6.v1.internal.ObjectBuilder;
 import io.weaviate.client6.v1.internal.grpc.protocol.WeaviateProtoAggregate;
 import io.weaviate.client6.v1.internal.grpc.protocol.WeaviateProtoBaseSearch;
 import io.weaviate.client6.v1.internal.grpc.protocol.WeaviateProtoSearchGet;
 
 public record NearText(List<String> concepts, Float distance, Float certainty, Move moveTo, Move moveAway,
-    BaseQueryOptions common) implements SearchOperator, ObjectFilter {
+    BaseQueryOptions common) implements QueryOperator, AggregateObjectFilter {
 
   public static NearText of(String... concepts) {
     return of(Arrays.asList(concepts), ObjectBuilder.identity());

src/main/java/io/weaviate/client6/v1/api/collections/query/NearVector.java

@@ -2,7 +2,7 @@
 
 import java.util.function.Function;
 
-import io.weaviate.client6.v1.api.collections.aggregate.ObjectFilter;
+import io.weaviate.client6.v1.api.collections.aggregate.AggregateObjectFilter;
 import io.weaviate.client6.v1.internal.ObjectBuilder;
 import io.weaviate.client6.v1.internal.grpc.GRPC;
 import io.weaviate.client6.v1.internal.grpc.protocol.WeaviateProtoAggregate;
@@ -11,7 +11,7 @@
 import io.weaviate.client6.v1.internal.grpc.protocol.WeaviateProtoSearchGet;
 
 public record NearVector(Float[] vector, Float distance, Float certainty, BaseQueryOptions common)
-    implements SearchOperator, ObjectFilter {
+    implements QueryOperator, AggregateObjectFilter {
 
   public static final NearVector of(Float[] vector) {
     return of(vector, ObjectBuilder.identity());

src/main/java/io/weaviate/client6/v1/api/collections/query/QueryOperator.java

@@ -0,0 +1,7 @@
+package io.weaviate.client6.v1.api.collections.query;
+
+import io.weaviate.client6.v1.internal.grpc.protocol.WeaviateProtoSearchGet;
+
+interface QueryOperator {
+  void appendTo(WeaviateProtoSearchGet.SearchRequest.Builder req);
+}

src/main/java/io/weaviate/client6/v1/api/collections/query/QueryRequest.java

@@ -21,7 +21,7 @@
 import io.weaviate.client6.v1.internal.orm.CollectionDescriptor;
 import io.weaviate.client6.v1.internal.orm.PropertiesBuilder;
 
-public record QueryRequest(SearchOperator operator, GroupBy groupBy) {
+public record QueryRequest(QueryOperator operator, GroupBy groupBy) {
 
   static <T> Rpc<QueryRequest, WeaviateProtoSearchGet.SearchRequest, QueryResponse<T>, WeaviateProtoSearchGet.SearchReply> rpc(
       CollectionDescriptor<T> collection) {

src/main/java/io/weaviate/client6/v1/api/collections/query/SearchOperator.java

@@ -1,7 +1,29 @@
 package io.weaviate.client6.v1.api.collections.query;
 
-import io.weaviate.client6.v1.internal.grpc.protocol.WeaviateProtoSearchGet;
+import io.weaviate.client6.v1.internal.grpc.protocol.WeaviateProtoBaseSearch;
+import io.weaviate.client6.v1.internal.grpc.protocol.WeaviateProtoBaseSearch.SearchOperatorOptions.Operator;
 
-interface SearchOperator {
-  void appendTo(WeaviateProtoSearchGet.SearchRequest.Builder req);
+public class SearchOperator {
+  private final String operator;
+  private final Integer minimumOrTokensMatch;
+
+  public static final SearchOperator or(int minimumOrTokensMatch) {
+    return new SearchOperator("Or", minimumOrTokensMatch);
+  }
+
+  public static final SearchOperator and() {
+    return new SearchOperator("And", 0);
+  }
+
+  private SearchOperator(String operator, Integer minimumOrTokensMatch) {
+    this.operator = operator;
+    this.minimumOrTokensMatch = minimumOrTokensMatch;
+  }
+
+  void appendTo(WeaviateProtoBaseSearch.SearchOperatorOptions.Builder options) {
+    options.setOperator(operator == "And" ? Operator.OPERATOR_AND : Operator.OPERATOR_OR);
+    if (minimumOrTokensMatch != null) {
+      options.setMinimumOrTokensMatch(minimumOrTokensMatch);
+    }
+  }
 }

src/main/java/io/weaviate/client6/v1/api/collections/query/WeaviateQueryClient.java

@@ -23,13 +23,13 @@ protected Optional<WeaviateObject<T, Object, QueryMetadata>> byId(ById byId) {
   }
 
   @Override
-  protected final QueryResponse<T> performRequest(SearchOperator operator) {
+  protected final QueryResponse<T> performRequest(QueryOperator operator) {
     var request = new QueryRequest(operator, null);
     return this.transport.performRequest(request, QueryRequest.rpc(collection));
   }
 
   @Override
-  protected final QueryResponseGrouped<T> performRequest(SearchOperator operator, GroupBy groupBy) {
+  protected final QueryResponseGrouped<T> performRequest(QueryOperator operator, GroupBy groupBy) {
     var request = new QueryRequest(operator, groupBy);
     return this.transport.performRequest(request, QueryRequest.grouped(collection));
   }

src/main/java/io/weaviate/client6/v1/api/collections/query/WeaviateQueryClientAsync.java

@@ -24,13 +24,13 @@ protected CompletableFuture<Optional<WeaviateObject<T, Object, QueryMetadata>>>
   }
 
   @Override
-  protected final CompletableFuture<QueryResponse<T>> performRequest(SearchOperator operator) {
+  protected final CompletableFuture<QueryResponse<T>> performRequest(QueryOperator operator) {
     var request = new QueryRequest(operator, null);
     return this.transport.performRequestAsync(request, QueryRequest.rpc(collection));
   }
 
   @Override
-  protected final CompletableFuture<QueryResponseGrouped<T>> performRequest(SearchOperator operator, GroupBy groupBy) {
+  protected final CompletableFuture<QueryResponseGrouped<T>> performRequest(QueryOperator operator, GroupBy groupBy) {
     var request = new QueryRequest(operator, groupBy);
     return this.transport.performRequestAsync(request, QueryRequest.grouped(collection));
   }