Include only some records into the index, the low-level way

Indexes.xml

<?xml version="1.0" encoding="UTF-8"?>
<Export generator="Cache" version="25" zv="Cache for Windows (x86-64) 2015.1.1 (Build 505U)" ts="2016-03-11 17:41:46">
<Class name="Utils.Index">
<Super>%Persistent</Super>
<TimeChanged>63988,63646.134181</TimeChanged>
<TimeCreated>63988,50153.308704</TimeCreated>

<Property name="Name">
<Type>%String</Type>
</Property>

<Index name="NewIndex2">
<Properties>Name</Properties>
</Index>

<Method name="%FileIndices">
<Description>
This is a generated and modified method %FileIndices
It is generated by $$GenerateIndexFiler^%ocsCache4.mac
You'll need to write a real generator instead of this copy-paste</Description>
<Internal>1</Internal>
<ClassMethod>1</ClassMethod>
<FormalSpec><![CDATA[id:%String(MAXLEN=""),&pIndexHandle:%Binary]]></FormalSpec>
<ProcedureBlock>1</ProcedureBlock>
<ReturnType>%Status</ReturnType>
<ServerOnly>1</ServerOnly>
<Implementation><![CDATA[
	s $ZTrap="CatchError",sc=1
	Set bsv0N2=$Get(^Utils.IndexD(id))
	Set bsv0N3=$listget(bsv0N2,1)
	if bsv0N3'="" { set bsv0N1=$piece(bsv0N3,$extract(bsv0N3),$length(bsv0N3,$extract(bsv0N3))-1) set:bsv0N1'["." bsv0N1="User."_bsv0N1 if bsv0N1'=$classname() { quit $classmethod(bsv0N1,"%FileIndices",id,.pIndexHandle) }}
	If ('pIndexHandle)||($Ascii($Get(pIndexHandle("Utils.Index")),1)=1) {
		Set bsv0N4=" "_$listget(bsv0N2,2)
		If $listget(bsv0N2,2)'="" { // Added this check
			Set ^Utils.IndexI("NewIndex2",bsv0N4,id)=$listget(bsv0N2,1)
		}
	}
	QUIT 1
CatchError	s $ZTrap="" i $ZE'="" { s sc = $$Error^%apiOBJ(5002,$ZE) } q sc
]]></Implementation>
</Method>

<Method name="Test">
<Description>
do ##class(Utils.Index).Test()</Description>
<ClassMethod>1</ClassMethod>
<Implementation><![CDATA[
	do ..%KillExtent()
	set obj = ..%New()
	set obj.Name = "A"
	do obj.%Save()
	set obj = ..%New()
	do obj.%Save()
	set obj = ..%New()
	set obj.Name = "C"
	do obj.%Save()
	do ..%BuildIndices()
	zw ^Utils.IndexI
]]></Implementation>
</Method>

<Storage name="Default">
<Type>%Library.CacheStorage</Type>
<DataLocation>^Utils.IndexD</DataLocation>
<DefaultData>IndexDefaultData</DefaultData>
<IdLocation>^Utils.IndexD</IdLocation>
<IndexLocation>^Utils.IndexI</IndexLocation>
<StreamLocation>^Utils.IndexS</StreamLocation>
<Data name="IndexDefaultData">
<Value name="1">
<Value>%%CLASSNAME</Value>
</Value>
<Value name="2">
<Value>Name</Value>
</Value>
</Data>
</Storage>
</Class>
</Export>