Refs #3045. Removed deprecated SingleValueAccumulator from documentSources index.js

lib/pipeline/documentSources/index.js

@@ -2,7 +2,6 @@
 module.exports = {
 	CursorDocumentSource: require("./CursorDocumentSource.js"),
 	DocumentSource: require("./DocumentSource.js"),
-	FilterBaseDocumentSource: require("./FilterBaseDocumentSource.js"),
 	GroupDocumentSource: require("./GroupDocumentSource.js"),
 	LimitDocumentSource: require("./LimitDocumentSource.js"),
 	MatchDocumentSource: require("./MatchDocumentSource.js"),