diff --git a/core/src/db/engine/ExecutionEngineImpl.cpp b/core/src/db/engine/ExecutionEngineImpl.cpp
index 49f3c73b25..9352a34382 100644
--- a/core/src/db/engine/ExecutionEngineImpl.cpp
+++ b/core/src/db/engine/ExecutionEngineImpl.cpp
@@ -738,15 +738,22 @@ ExecutionEngineImpl::BuildIndex(const std::string& location, EngineType engine_t
 
     auto status = Status::OK();
     std::vector<segment::doc_id_t> uids;
+    faiss::ConcurrentBitsetPtr blacklist;
     if (from_index) {
         status = to_index->BuildAll(Count(), from_index->GetRawVectors(), from_index->GetRawIds(), conf);
         uids = from_index->GetUids();
+        from_index->GetBlacklist(blacklist);
     } else if (bin_from_index) {
         status = to_index->BuildAll(Count(), bin_from_index->GetRawVectors(), bin_from_index->GetRawIds(), conf);
         uids = bin_from_index->GetUids();
+        bin_from_index->GetBlacklist(blacklist);
     }
     to_index->SetUids(uids);
-    ENGINE_LOG_DEBUG << "set uids " << to_index->GetUids().size() << " for " << location;
+    ENGINE_LOG_DEBUG << "Set " << to_index->GetUids().size() << "uids for " << location;
+    if (blacklist != nullptr) {
+        to_index->SetBlacklist(blacklist);
+        ENGINE_LOG_DEBUG << "Set blacklist for index " << location;
+    }
 
     if (!status.ok()) {
         throw Exception(DB_ERROR, status.message());
diff --git a/core/unittest/db/utils.cpp b/core/unittest/db/utils.cpp
index 77fe031d26..3d9863f159 100644
--- a/core/unittest/db/utils.cpp
+++ b/core/unittest/db/utils.cpp
@@ -65,7 +65,7 @@ static const char *CONFIG_STR =
     "  cpu_cache_capacity: 4             # GB, CPU memory used for cache\n"
     "  cpu_cache_threshold: 0.85         # percentage of data kept when cache cleanup triggered\n"
     "  insert_buffer_size: 4             # GB, maximum insert buffer size allowed\n"
-    "  cache_insert_data: false          # whether load inserted data into cache\n"
+    "  cache_insert_data: true          # whether load inserted data into cache\n"
     "\n"
     "engine_config:\n"
     "  use_blas_threshold: 20\n"
@@ -179,6 +179,7 @@ DBTest::SetUp() {
     milvus::scheduler::JobMgrInst::GetInstance()->Start();
 
     auto options = GetOptions();
+    options.insert_cache_immediately_ = true;
     db_ = milvus::engine::DBFactory::Build(options);
 
     std::string config_path(options.meta_.path_ + CONFIG_FILE);