feat(config): support dropping vector index

.github/workflows/test.yaml

@@ -91,7 +91,8 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        WEAVIATE_VERSION: ["1.32.24", "1.33.11", "1.34.7", "1.35.2", "1.36.1"]
+        WEAVIATE_VERSION:
+          ["1.32.24", "1.33.11", "1.34.7", "1.35.2", "1.36.9", "1.37.0-rc.0"]
     steps:
       - uses: actions/checkout@v4
 

src/it/java/io/weaviate/containers/Weaviate.java

@@ -44,7 +44,8 @@ public enum Version {
     V133(1, 33, 11),
     V134(1, 34, 7),
     V135(1, 35, 2),
-    V136(1, 36, 1);
+    V136(1, 36, 9),
+    V137(1, 37, "0-rc.0");
 
     public final SemanticVersion semver;
 

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

@@ -372,6 +372,31 @@ public void test_dropPropertyIndex() throws IOException {
             .returns(false, Property::indexRangeFilters));
   }
 
+  @Test
+  public void test_dropVectorIndex() throws IOException {
+    Weaviate.Version.V137.orSkip();
+
+    // Arrange
+    var nsThings = ns("Things");
+    var things = client.collections.create(nsThings,
+        c -> c.vectorConfig(VectorConfig.selfProvided("leaveme"), VectorConfig.selfProvided("dropme")));
+
+    var config = things.config.get();
+    Assertions.assertThat(config).get()
+        .extracting(CollectionConfig::vectors, InstanceOfAssertFactories.map(String.class, VectorConfig.class))
+        .hasSize(2)
+        .containsKey("dropme");
+
+    things.config.dropVectorIndex("dropme");
+
+    config = things.config.get();
+    Assertions.assertThat(config).get()
+        .extracting(CollectionConfig::vectors, InstanceOfAssertFactories.map(String.class, VectorConfig.class))
+        .hasSize(2)
+        .extractingByKey("dropme")
+        .returns(null, VectorConfig::vectorIndex); // A dropped index has not vectorIndex configuration.
+  }
+
   @Test
   public void test_asyncReplicationConfig() throws IOException {
     Weaviate.Version.latest().orSkip();

src/main/java/io/weaviate/client6/v1/api/collections/VectorConfig.java

@@ -1695,7 +1695,12 @@ public void write(JsonWriter out, VectorConfig value) throws IOException {
         @Override
         public VectorConfig read(JsonReader in) throws IOException {
           var jsonObject = JsonParser.parseReader(in).getAsJsonObject();
-          var vectorIndexConfig = jsonObject.get("vectorIndexConfig").getAsJsonObject();
+          JsonObject vectorIndexConfig = new JsonObject();
+          if (jsonObject.has("vectorIndexConfig")) {
+            // If the vector index has been dropped it will still be present in the
+            // response, but won't contain "vectorIndexConfig" and "vectorIndexType" fields.
+            vectorIndexConfig = jsonObject.get("vectorIndexConfig").getAsJsonObject();
+          }
 
           String quantizationKind = null;
           for (var kind : new String[] {

src/main/java/io/weaviate/client6/v1/api/collections/VectorIndex.java

@@ -137,8 +137,22 @@ public void write(JsonWriter out, VectorIndex value) throws IOException {
         public VectorIndex read(JsonReader in) throws IOException {
           var jsonObject = JsonParser.parseReader(in).getAsJsonObject();
 
+          var vectorIndexType = jsonObject.get("vectorIndexType");
+          if (vectorIndexType == null || vectorIndexType.isJsonNull()) {
+            // VectorConfig.CustomTypeAdapterFactory cannot provide this
+            // value for vector indexes that have been dropped.
+            return null;
+          }
+
+          var vectorIndexConfig = jsonObject.get("vectorIndexConfig");
+          if (vectorIndexConfig == null || vectorIndexConfig.isJsonNull()) {
+            // VectorConfig.CustomTypeAdapterFactory cannot provide this
+            // value for vector indexes that have been dropped.
+            return null;
+          }
+
           VectorIndex.Kind kind;
-          var kindString = jsonObject.get("vectorIndexType").getAsString();
+          var kindString = vectorIndexType.getAsString();
           try {
             kind = VectorIndex.Kind.valueOfJson(kindString);
           } catch (IllegalArgumentException e) {
@@ -150,7 +164,7 @@ public VectorIndex read(JsonReader in) throws IOException {
             return null;
           }
 
-          var config = jsonObject.get("vectorIndexConfig").getAsJsonObject();
+          var config = vectorIndexConfig.getAsJsonObject();
           return adapter.fromJsonTree(config);
         }
       }.nullSafe();

src/main/java/io/weaviate/client6/v1/api/collections/config/DeleteVectorIndexRequest.java

@@ -0,0 +1,13 @@
+package io.weaviate.client6.v1.api.collections.config;
+
+import java.util.Collections;
+
+import io.weaviate.client6.v1.internal.rest.Endpoint;
+import io.weaviate.client6.v1.internal.rest.SimpleEndpoint;
+
+public record DeleteVectorIndexRequest(String collectionName, String vectorName) {
+  public static final Endpoint<DeleteVectorIndexRequest, Void> _ENDPOINT = SimpleEndpoint.sideEffect(
+      request -> "DELETE",
+      request -> "/schema/" + request.collectionName + "/vectors/" + request.vectorName + "/index",
+      request -> Collections.emptyMap());
+}

src/main/java/io/weaviate/client6/v1/api/collections/config/WeaviateConfigClient.java

@@ -58,6 +58,12 @@ public void dropPropertyIndex(String propertyName, PropertyIndexType indexType)
         DeletePropertyIndexRequest._ENDPOINT);
   }
 
+  public void dropVectorIndex(String vectorName) throws IOException {
+    this.restTransport.performRequest(
+        new DeleteVectorIndexRequest(collection.collectionName(), vectorName),
+        DeleteVectorIndexRequest._ENDPOINT);
+  }
+
   public void addReference(String propertyName, String... dataTypes) throws IOException {
     this.addProperty(ReferenceProperty.to(propertyName, dataTypes).toProperty());
   }

src/main/java/io/weaviate/client6/v1/api/collections/config/WeaviateConfigClientAsync.java

@@ -59,6 +59,12 @@ public CompletableFuture<Void> dropPropertyIndex(String propertyName, PropertyIn
         DeletePropertyIndexRequest._ENDPOINT);
   }
 
+  public CompletableFuture<Void> dropVectorIndex(String vectorName) throws IOException {
+    return this.restTransport.performRequestAsync(
+        new DeleteVectorIndexRequest(collection.collectionName(), vectorName),
+        DeleteVectorIndexRequest._ENDPOINT);
+  }
+
   public CompletableFuture<Void> addReference(String name, String... dataTypes) throws IOException {
     return this.addProperty(ReferenceProperty.to(name, dataTypes).toProperty());
   }