Here is the output:

Schema difference:
"./" != "./" (NodeDifference): Unknown
+Tables: "./Tables (170)" != "./Tables (170)" (NodeCollectionDifference): 1 change(s)
"./Tables/RegLanguagePack" != "./Tables/RegLanguagePack" (NodeDifference): Unknown
+SecondaryIndexes: "./Tables/RegLanguagePack/SecondaryIndexes (2)" != "./Tables/RegLanguagePack/SecondaryIndexes (2)" (NodeCollectionDifference): 1 change(s)
"./Tables/RegLanguagePack/SecondaryIndexes/IXP_RegLanguagePack_Index" != "./Tables/RegLanguagePack/SecondaryIndexes/IXP_RegLanguagePack_Index" (NodeDifference): Unknown
+Filter: "([IsActive]=CONVERT([bit],(1)))" != "([IsActive] = cast(1 as bit))" (ValueDifference): values differ

The index is defined like this:

[Index("IsActive", Filter = "Index", Unique = true)]

/// <summary>
        /// Частичный индекс
        /// </summary>
        public static Expression<Func<RegLanguagePack, bool>> Index
        {
            get { return r => r.IsActive == true; }
        }