fix: HNSW schema deleting document crash (#4987)

fixed: #4979

Author: vyavdoshenko

src/core/search/indices.cc

@@ -281,7 +281,10 @@ struct HnswlibAdapter {
   }
 
   void Remove(DocId id) {
-    world_.markDelete(id);
+    try {
+      world_.markDelete(id);
+    } catch (const std::exception& e) {
+    }
   }
 
   vector<pair<float, DocId>> Knn(float* target, size_t k, std::optional<size_t> ef) {

src/server/search/search_family_test.cc

@@ -2722,6 +2722,18 @@ TEST_F(SearchFamilyTest, JsonWithNullFields) {
               AreDocIds("doc:1", "doc:2"));
 }
 
+TEST_F(SearchFamilyTest, TestHsetDeleteDocumentHnswSchemaCrash) {
+  EXPECT_EQ(Run({"FT.CREATE", "idx", "SCHEMA", "n", "NUMERIC", "v", "VECTOR", "HNSW", "8", "TYPE",
+                 "FLOAT16", "DIM", "4", "DISTANCE_METRIC", "L2", "M", "65536"}),
+            "OK");
+
+  auto res = Run({"HSET", "doc", "n", "0"});
+  EXPECT_EQ(res, 1);
+
+  res = Run({"DEL", "doc"});
+  EXPECT_EQ(res, 1);
+}
+
 TEST_F(SearchFamilyTest, RenameDocumentBetweenIndices) {
   absl::FlagSaver fs;