JAVA-1152: For update command, only write multi or upsert field if the value is not the default.
JAVA-1152: For update command, only write multi or upsert field if the value is not the default.

jsonking/mongo-java-driver,gianpaj/mongo-java-driver,rozza/mongo-java-driver,rozza/mongo-java-driver,jsonking/mongo-java-driver,PSCGroup/mongo-java-driver,jyemin/mongo-java-driver,kay-kim/mongo-java-driver,jyemin/mongo-java-driver