fix: add missing / before {shard_name} path param

Include integration test to test the basic functionality

Author: bevzzz

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

@@ -13,6 +13,8 @@
 import io.weaviate.client6.v1.api.collections.Property;
 import io.weaviate.client6.v1.api.collections.Replication;
 import io.weaviate.client6.v1.api.collections.VectorIndex;
+import io.weaviate.client6.v1.api.collections.config.Shard;
+import io.weaviate.client6.v1.api.collections.config.ShardStatus;
 import io.weaviate.client6.v1.api.collections.vectorindex.Hnsw;
 import io.weaviate.client6.v1.api.collections.vectorizers.NoneVectorizer;
 import io.weaviate.containers.Container;
@@ -159,4 +161,27 @@ public void testUpdateCollection() throws IOException {
               .extracting(CollectionConfig::replication).returns(false, Replication::asyncEnabled);
         });
   }
+
+  @Test
+  public void testShards() throws IOException {
+    var nsShatteredCups = ns("ShatteredCups");
+    client.collections.create(nsShatteredCups);
+    var cups = client.collections.use(nsShatteredCups);
+
+    // Act: get initial shard state
+    var shards = cups.config.getShards();
+
+    Assertions.assertThat(shards).as("single-tenant collections has 1 shard").hasSize(1);
+    var singleShard = shards.get(0);
+
+    // Act: flip the status
+    var wantStatus = singleShard.status().equals("READY") ? ShardStatus.READONLY : ShardStatus.READY;
+    var updated = cups.config.updateShards(wantStatus, singleShard.name());
+
+    Assertions.assertThat(updated)
+        .as("shard status changed")
+        .hasSize(1)
+        .extracting(Shard::status)
+        .containsOnly(wantStatus.name());
+  }
 }

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

@@ -11,7 +11,7 @@
 public record UpdateShardStatusRequest(String collection, String shard, ShardStatus status) {
   public static final Endpoint<UpdateShardStatusRequest, Void> _ENDPOINT = Endpoint.of(
       request -> "PUT",
-      request -> "/schema/" + request.collection + "/shards" + request.shard,
+      request -> "/schema/" + request.collection + "/shards/" + request.shard,
       (gson, request) -> JSON.serialize(Map.of("status", request.status)),
       request -> Collections.emptyMap(),
       code -> code != HttpStatus.SC_SUCCESS,