"org.terrier.structures.DirectIndexInputStream",
"org.terrier.structures.Index,java.lang.String,java.lang.Class",
"index,structureName,"+ BasicIterablePostingDocidOnly.class.getName());
index.setIndexProperty("index.direct.fields.count", ""+FieldScore.FIELDS_COUNT );
index.setIndexProperty("index.direct.fields.names", ArrayUtils.join(FieldScore.FIELD_NAMES, ","));
index.addIndexStructure("document-factory", BasicDocumentIndexEntry.Factory.class.getName(), "", "");
index.flush();
DocumentIndex di = index.getDocumentIndex();
assertNotNull(di);
assertEquals(postings.length, di.getNumberOfDocuments());
return index;