Rule Definition
When using compound indexes, avoid having different indexes. Indeed, Mongo DB give the compound index, when we have index on more than two column, it is always good to have the indexes put the same way,it is highly recommended to have the indexes, either both positives(ascending) or either both negatives(descending).

Remediation
Use instead indexes, either both positives(ascending) or either both negatives(descending)

Violation Code Sample

MongoClient conn_str = new MongoClient("localhost", 27017);
		
		DB db = conn_str.getDB("database");
		
		DBCollection docColl = db.getCollection("document");
		
		docColl.createIndex(new BasicDBObject("filed_1",1),
		
		new BasicDBObject("_id", -1),
		
		new BasicDBObject("filed_2", -1));

Fixed Code Sample

MongoClient conn_str = new MongoClient("localhost", 27017);
		
		DB db = conn_str.getDB("database");
		
		DBCollection docColl = db.getCollection("document");
		
		docColl.createIndex(new BasicDBObject("filed_1",1), 
		
		new BasicDBObject("_id", 1), 
		
		new BasicDBObject("filed_2", 1));