....
    optionsBuilder.ReplaceService<ICoreConventionSetBuilder, AppCoreConventionSetBuilder>();
    ....

    class AppCoreConventionSetBuilder : CoreConventionSetBuilder
    {
        public AppCoreConventionSetBuilder(CoreConventionSetBuilderDependencies dependencies)
            : base(dependencies)
        { }

        public override ConventionSet CreateConventionSet()
        {
            var result = base.CreateConventionSet();

            var foreignKeyIndexConvention = result.BaseEntityTypeChangedConventions.OfType<ForeignKeyIndexConvention>().First();
            result.BaseEntityTypeChangedConventions.Remove(foreignKeyIndexConvention);
            result.KeyAddedConventions.Remove(foreignKeyIndexConvention);
            result.KeyRemovedConventions.Remove(foreignKeyIndexConvention);
            result.ForeignKeyAddedConventions.Remove(foreignKeyIndexConvention);
            result.ForeignKeyRemovedConventions.Remove(foreignKeyIndexConvention);
            result.ForeignKeyUniquenessChangedConventions.Remove(foreignKeyIndexConvention);
            result.ModelBuiltConventions.Remove(foreignKeyIndexConvention);
            result.IndexAddedConventions.Remove(foreignKeyIndexConvention);
            result.IndexRemovedConventions.Remove(foreignKeyIndexConvention);
            result.IndexUniquenessChangedConventions.Remove(foreignKeyIndexConvention);

            return result;
        }
    }