How to create document crawler smart search index using the API?

Our Developer’s guide describes how to create smart search indexes using the API.  With the exception of the Document crawler index type, you can set a value of the newIndex.IndexType property from PredefinedObjectType enumerator.

For example: newIndex.IndexType = PredefinedObjectType.DOCUMENT;

However, the document crawler index type specifically needs to be set like this:
newIndex.IndexType = SearchHelper.DOCUMENTS_CRAWLER_INDEX;

So, a complete API example would look like:

// Create new search index object
SearchIndexInfo newIndex = new SearchIndexInfo();

// Set the properties
newIndex.IndexDisplayName = "My new index";
newIndex.IndexName = "MyNewIndex";
newIndex.IndexIsCommunityGroup = false;
newIndex.IndexType = SearchHelper.DOCUMENTS_CRAWLER_INDEX;
newIndex.IndexAnalyzerType = AnalyzerTypeEnum.StandardAnalyzer;
newIndex.StopWordsFile = "";

// Save the search index
SearchIndexInfoProvider.SetSearchIndexInfo(newIndex);