How to use

checkArgument

method

in

org.apache.james.backends.es.ElasticSearchIndexer

public IndexResponse index(String id, String content) {
  checkArgument(content);
  if (LOGGER.isDebugEnabled()) {
    LOGGER.debug("Indexing {}: {}", id, StringUtils.left(content, DEBUG_MAX_LENGTH_CONTENT));
  }
  return client.prepareIndex(aliasName.getValue(), typeName.getValue(), id)
    .setSource(content)
    .get();
}