assertEquals(0, queryFieldConfig.sortFieldSet.size());

        // Should return false for any field, not throw exception
        assertFalse(queryFieldConfig.isSortField("anyfield"));
        assertFalse(queryFieldConfig.isSortField("score"));
        assertFalse(queryFieldConfig.isSortField(""));
    }

    /**

        assertFalse(queryFieldConfig.isSortField("anyfield"));
        assertFalse(queryFieldConfig.isSortField(""));
        assertFalse(queryFieldConfig.isSortField(null));
    }

    @Test
    public void test_isFacetField_withEmptyArray() {
        queryFieldConfig.setFacetFields(new String[] {});

        assertFalse(queryFieldConfig.isFacetField("anyfield"));
        assertFalse(queryFieldConfig.isFacetField(""));

        queryFieldConfig.setSearchFields(new String[] {});

        assertFalse(queryCommand.isSearchField("title"));
        assertFalse(queryCommand.isSearchField("content"));
        assertFalse(queryCommand.isSearchField("anyfield"));
    }

    /**
     * Test isSearchField() performance with large field set.
     */
    @Test
    public void test_isSearchField_performance() {
        // Create a large set of search fields

        // No system properties set - should pass without checking

        final File anyFile = new File(tempDir.toFile(), "any/test.txt");
        anyFile.getParentFile().mkdirs();
        anyFile.createNewFile();

        // Should not throw when no allowed paths are configured
        action.validateFilePath(anyFile.getAbsolutePath());
    }

 * suggestRequest.setIndex("my_index");
 * suggestRequest.setQuery("example query");
 * suggestRequest.setSize(5);
 * suggestRequest.addTag("tag1");
 * suggestRequest.addRole("role1");
 * suggestRequest.addField("field1");
 * suggestRequest.addKind("kind1");
 * suggestRequest.addLang("en");
 * suggestRequest.setSuggestDetail(true);
 * suggestRequest.setReadingConverter(new MyReadingConverter());

    @Test
    public void test_addRole() {
        request.addRole("role1");
        request.addRole("role2");
    }

    @Test
    public void test_addField() {
        request.addField("field1");
        request.addField("field2");
    }

    @Test
    public void test_addKind() {
        request.addKind("DOCUMENT");
        request.addKind("QUERY");
    }

    @Test

          continue
        }

        val value = value(i)
        if (result == null) {
          result = TreeSet(String.CASE_INSENSITIVE_ORDER)
        }
        for (varyField in value.split(',')) {
          result.add(varyField.trim())
        }
      }
      return result ?: emptySet()
    }

    /**
     * Returns the subset of the headers in this's request that impact the content of this's body.

            final SuggestRequestBuilder builder = suggestHelper.suggester().suggest();
            builder.setQuery(parameter.getQuery());
            stream(parameter.getSuggestFields()).of(stream -> stream.forEach(builder::addField));
            roleQueryHelper.build(SearchRequestType.SUGGEST).stream().forEach(builder::addRole);
            builder.setSize(parameter.getNum());
            stream(langs).of(stream -> stream.forEach(builder::addLang));

  
  This change implements a deep copy of the `Fields` map for each composition environment, ensuring thread safety.
  
  ### Issue