Map<String, Object> doc = new HashMap<>();
        doc.put("lang", "ja");
        doc.put("title", "タイトル");
        doc.put("title_ja", "既存のタイトル"); // Should not be overwritten
        doc.put("content", "コンテンツ");

        languageHelper.updateDocument(doc);

        assertEquals("ja", doc.get("lang"));
        assertEquals("既存のタイトル", doc.get("title_ja")); // Should remain unchanged

        queryFieldConfig.setNotAnalyzedFields(existingNotAnalyzedFields);

        // Initialize
        queryFieldConfig.init();

        // Verify that existing fields are not overwritten
        assertSame(existingResponseFields, queryFieldConfig.getResponseFields());
        assertSame(existingScrollResponseFields, queryFieldConfig.getScrollResponseFields());

   * need to guard against those conditions, you should employ other file-level synchronization.
   *
   * <p><b>Warning:</b> If {@code to} represents an existing file, that file will be overwritten
   * with the contents of {@code from}. If {@code to} and {@code from} refer to the <i>same</i>
   * file, the contents of that file will be deleted.
   *
   * <p><b>{@link java.nio.file.Path} equivalent:</b> {@link

   * need to guard against those conditions, you should employ other file-level synchronization.
   *
   * <p><b>Warning:</b> If {@code to} represents an existing file, that file will be overwritten
   * with the contents of {@code from}. If {@code to} and {@code from} refer to the <i>same</i>
   * file, the contents of that file will be deleted.
   *
   * <p><b>{@link java.nio.file.Path} equivalent:</b> {@link

        assertTrue(values[1].startsWith("time:"));
        assertTrue(values[2].startsWith("done:"));

        // CrawlerStatsHelper uses LinkedHashMap which overwrites values with same key
        // Recording the same action twice will overwrite the first one
        assertTrue(values[3].startsWith("same_action:"));
        assertTrue(values[4].startsWith("different_action:"));
    }

    }

    public void test_processFieldConfigs() {
        final FessFileTransformer transformer = createInstance();
        final Map<String, String> params = Maps.of("foo", "cache", "bar", "overwrite", "baz", "cache|overwrite");
        FieldConfigs fieldConfigs = new FieldConfigs(params);
        final Map<String, Object> dataMap = Map.of(//
                "foo", new String[] { "aaa", "bbb" }, //

                  </fileset>
                </copy>
                <!-- Any manually written supersource should take priority over the original guava source, so we set overwrite=true. -->
                <copy toDir="${project.build.directory}/guava-gwt-sources" overwrite="true">
                  <fileset dir="src-super" />
                </copy>
                <copy toDir="${project.build.directory}/guava-test-gwt-sources">

        dataMap.keySet()
                .stream()
                .filter(key -> key.endsWith(".overwrite")) //
                .collect(Collectors.toList())
                .forEach(key -> {
                    final String baseKey = key.substring(0, key.length() - ".overwrite".length());
                    final Object value = dataMap.remove(key);
                    dataMap.put(baseKey, value);

    int mask = tableSize - 1;
    // If duplicates are allowed, this IdentityHashMap will record the final Entry for each
    // duplicated key. We will use this final Entry to overwrite earlier slots in the entries array
    // that have the same key. Then a second pass will remove all but the first of the slots that
    // have this Entry. The value in the map becomes false when this first entry has been copied, so

          putRangeMapEntry(
              rangeToRemove.upperBound,
              rangeMapEntry.getUpperBound(),
              mapEntryBelowToTruncate.getValue().getValue());
        }
        // overwrite mapEntryToTruncateBelow with a truncated range
        putRangeMapEntry(
            rangeMapEntry.getLowerBound(),
            rangeToRemove.lowerBound,
            mapEntryBelowToTruncate.getValue().getValue());