diff --git a/core/src/db/engine/ExecutionEngineImpl.cpp b/core/src/db/engine/ExecutionEngineImpl.cpp
index d1f21ebc42..397ca89d68 100644
--- a/core/src/db/engine/ExecutionEngineImpl.cpp
+++ b/core/src/db/engine/ExecutionEngineImpl.cpp
@@ -257,6 +257,11 @@ ExecutionEngineImpl::PhysicalSize() const {
 Status
 ExecutionEngineImpl::Serialize() {
     auto status = write_index(index_, location_);
+
+    // here we reset index size by file size,
+    // since some index type(such as SQ8) data size become smaller after serialized
+    index_->set_size(PhysicalSize());
+
     return status;
 }
 
diff --git a/docs/test_report_en/ivfsq8_test.md b/docs/test_report/milvus_ivfsq8_test_report_detailed_version.md
similarity index 100%
rename from docs/test_report_en/ivfsq8_test.md
rename to docs/test_report/milvus_ivfsq8_test_report_detailed_version.md
diff --git a/docs/test_report_cn/ivfsq8_test.md b/docs/test_report/milvus_ivfsq8_test_report_detailed_version_cn.md
similarity index 100%
rename from docs/test_report_cn/ivfsq8_test.md
rename to docs/test_report/milvus_ivfsq8_test_report_detailed_version_cn.md
diff --git a/docs/test_report_en/ivfsq8h_test.md b/docs/test_report/milvus_ivfsq8h_test_report_detailed_version.md
similarity index 100%
rename from docs/test_report_en/ivfsq8h_test.md
rename to docs/test_report/milvus_ivfsq8h_test_report_detailed_version.md
diff --git a/docs/test_report_cn/ivfsq8h_test.md b/docs/test_report/milvus_ivfsq8h_test_report_detailed_version_cn.md
similarity index 100%
rename from docs/test_report_cn/ivfsq8h_test.md
rename to docs/test_report/milvus_ivfsq8h_test_report_detailed_version_cn.md