fix: Fix panic caused by removing directory (#38622)

https://github.com/milvus-io/milvus/issues/38604

---------

Signed-off-by: sunby <sunbingyi1992@gmail.com>

internal/core/src/index/InvertedIndexTantivy.cpp

@@ -103,6 +103,9 @@ InvertedIndexTantivy<T>::InvertedIndexTantivy(
 
 template <typename T>
 InvertedIndexTantivy<T>::~InvertedIndexTantivy() {
+    if (wrapper_) {
+        wrapper_->free();
+    }
     auto local_chunk_manager =
         storage::LocalChunkManagerSingleton::GetInstance().GetChunkManager();
     auto prefix = path_;

internal/core/src/storage/LocalChunkManager.cpp

@@ -15,6 +15,8 @@
 // limitations under the License.
 
 #include "LocalChunkManager.h"
+#include "boost/algorithm/string/join.hpp"
+#include "boost/filesystem/directory.hpp"
 #include "log/Log.h"
 
 #include <boost/filesystem.hpp>
@@ -217,10 +219,18 @@ LocalChunkManager::RemoveDir(const std::string& dir) {
     boost::system::error_code err;
     boost::filesystem::remove_all(dirPath, err);
     if (err) {
+        boost::filesystem::directory_iterator it(dirPath);
+        std::vector<std::string> paths;
+        for (; it != boost::filesystem::directory_iterator(); ++it) {
+            paths.push_back(it->path().string());
+        }
+        std::string files = boost::algorithm::join(paths, ", ");
         PanicInfo(FileWriteFailed,
-                  fmt::format("remove local directory:{} failed, error: {}",
-                              dir,
-                              err.message()));
+                  fmt::format(
+                      "remove local directory:{} failed, error: {}, files: {}",
+                      dir,
+                      err.message(),
+                      files));
     }
 }
 

internal/core/thirdparty/tantivy/tantivy-wrapper.h

@@ -588,23 +588,25 @@ struct TantivyIndexWrapper {
         return reader_;
     }
 
- private:
-    void
-    check_search() {
-        // TODO
-    }
-
     void
     free() {
         if (writer_ != nullptr) {
             tantivy_free_index_writer(writer_);
+            writer_ = nullptr;
         }
 
         if (reader_ != nullptr) {
             tantivy_free_index_reader(reader_);
+            reader_ = nullptr;
         }
     }
 
+ private:
+    void
+    check_search() {
+        // TODO
+    }
+
  private:
     bool finished_ = false;
     IndexWriter writer_ = nullptr;