output: #fixed code
                                  @Override
      public void refreshIndex(Map<String, Pair<DimensionRow, DimensionRow>> changedRows) {
          // Make a single Document instance to hold field data being updated to Lucene
          // Creating documents is costly and so Document will be reused for each record being processed due to
          // performance best practices.
          Document doc = new Document();
          Map<DimensionField, Field> dimFieldToLuceneField = new HashMap<>(dimension.getDimensionFields().size());
  
          // Create the document fields for this dimension and add them to the document
          for (DimensionField dimensionField : dimension.getDimensionFields()) {
              Field luceneField = new StringField(
                      DimensionStoreKeyUtils.getColumnKey(dimensionField.getName()),
                      "",
                      dimensionField.equals(dimension.getKey()) ? Field.Store.YES : Field.Store.NO
              );
  
              // Store the lucene field in the doc and in our lookup map
              dimFieldToLuceneField.put(dimensionField, luceneField);
              doc.add(luceneField);
          }
  
          // Write the rows to the document
          IndexWriterConfig indexWriterConfig = new IndexWriterConfig(LUCENE_ANALYZER).setRAMBufferSizeMB(BUFFER_SIZE);
          lock.writeLock().lock();
          try {
              try (IndexWriter luceneIndexWriter = new IndexWriter(luceneDirectory, indexWriterConfig)) {
                  // Update the document fields for each row and update the document
                  for (String rowId : changedRows.keySet()) {
                      // Get the new row from the pair
                      DimensionRow newDimensionRow = changedRows.get(rowId).getKey();
  
                      // Update the index
                      updateDimensionRow(doc, dimFieldToLuceneField, luceneIndexWriter, newDimensionRow);
                  }
  
              } catch (IOException e) {
                  luceneIndexIsHealthy = false;
                  LOG.error("Failed to refresh index for dimension rows", e);
                  throw new RuntimeException(e);
                  // Commit all the changes to the index (on .close, called by try-resources) and refresh the cardinality
              }
              //This must be outside the try-resources block because it may _also_ need to open an IndexWriter, and
              //opening an IndexWriter involves taking a write lock on lucene, of which there can only be one at a time.
              reopenIndexSearcher(true);
              refreshCardinality();
          } finally {
              lock.writeLock().unlock();
          }
      }
input: #vulnerable code 
                                  @Override
      public void refreshIndex(Map<String, Pair<DimensionRow, DimensionRow>> changedRows) {
          // Make a single Document instance to hold field data being updated to Lucene
          // Creating documents is costly and so Document will be reused for each record being processed due to
          // performance best practices.
          Document doc = new Document();
          Map<DimensionField, Field> dimFieldToLuceneField = new HashMap<>(dimension.getDimensionFields().size());
  
          // Create the document fields for this dimension and add them to the document
          for (DimensionField dimensionField : dimension.getDimensionFields()) {
              Field luceneField = new StringField(
                      DimensionStoreKeyUtils.getColumnKey(dimensionField.getName()),
                      "",
                      dimensionField.equals(dimension.getKey()) ? Field.Store.YES : Field.Store.NO
              );
  
              // Store the lucene field in the doc and in our lookup map
              dimFieldToLuceneField.put(dimensionField, luceneField);
              doc.add(luceneField);
          }
  
          // Write the rows to the document
          IndexWriterConfig indexWriterConfig = new IndexWriterConfig(LUCENE_ANALYZER).setRAMBufferSizeMB(BUFFER_SIZE);
          lock.writeLock().lock();
          try (IndexWriter luceneIndexWriter = new IndexWriter(luceneDirectory, indexWriterConfig)) {
              // Update the document fields for each row and update the document
              for (String rowId : changedRows.keySet()) {
                  // Get the new row from the pair
                  DimensionRow newDimensionRow = changedRows.get(rowId).getKey();
  
                  // Update the index
                  updateDimensionRow(doc, dimFieldToLuceneField, luceneIndexWriter, newDimensionRow);
              }
  
              // Commit all the changes to the index (on .close, called by try-resources) and refresh the cardinality
          } catch (IOException e) {
              luceneIndexIsHealthy = false;
              LOG.error("Failed to refresh index for dimension rows", e);
              throw new RuntimeException(e);
          } finally {
              lock.writeLock().unlock();
          }
          reopenIndexSearcher(true);
          refreshCardinality();
      } 
                              #location 44 
                              #vulnerability type THREAD_SAFETY_VIOLATION