docs: private static void mergeKafka10ImportConfigurations(Map<String, ImportConfiguration> processorConfig) {
          if (processorConfig.isEmpty()) {
              return;
          }
  
          Map<String, ImportConfiguration> kafka10ProcessorConfigs = new HashMap<>();
          Iterator<Map.Entry<String, ImportConfiguration>> iter = processorConfig.entrySet().iterator();
          while (iter.hasNext()) {
              String configName = iter.next().getKey();
              ImportConfiguration importConfig = processorConfig.get(configName);
              Properties properties = importConfig.getmoduleProperties();
  
              String importBundleJar = properties.getProperty(ImportDataProcessor.IMPORT_MODULE);
              Preconditions.checkNotNull(importBundleJar,
                      "Import source is undefined or custom import plugin class missing.");
              //handle special cases for kafka 10 and maybe late versions
              String[] bundleJar = importBundleJar.split("kafkastream");
              if (bundleJar.length > 1) {
                  String version = bundleJar[1].substring(0, bundleJar[1].indexOf(".jar"));
                  if (!version.isEmpty()) {
                      int versionNumber = Integer.parseInt(version);
                      if (versionNumber == 10) {
                          kafka10ProcessorConfigs.put(configName, importConfig);
                          iter.remove();
                      }
                  }
              }
          }
  
          if (kafka10ProcessorConfigs.isEmpty()) {
              return;
          }
  
          Map<String, ImportConfiguration> mergedConfigs = new HashMap<>();
          iter = kafka10ProcessorConfigs.entrySet().iterator();
          while (iter.hasNext()) {
              ImportConfiguration importConfig = iter.next().getValue();
              Properties props = importConfig.getmoduleProperties();
  
              //organize the kafka10 importer by the broker list and group id
              //All importers must be configured by either broker list or zookeeper in the same group
              //otherwise, these importers can not be correctly merged.
              String brokers = props.getProperty("brokers");
              String groupid = props.getProperty("groupid", "voltdb");
              if (brokers == null) {
                  brokers = props.getProperty("zookeeper");
              }
              String brokersGroup = brokers + "_" + groupid;
              ImportConfiguration config = mergedConfigs.get(brokersGroup);
              if (config == null) {
                  mergedConfigs.put(brokersGroup, importConfig);
              } else {
                  config.mergeProperties(props);
              }
          }
          processorConfig.putAll(mergedConfigs);
      }