Highlighting Parent Documents

[Nicolas Paris]

Hi

I have read here [1] and here [2] that it is possible to highlight only
parent documents in block join queries. But I didn't succeed yet:

So here is my nested document example:
[
{
"id": "2",
"type_s": "parent",
"content_txt": ["apache"],
"_childDocuments_": [
{
"id": "1",
"type_s": "child",
"content_txt": ["solr"]
}
]
}
]

Here is my query (=give me document that have a parent which contain
"apache" term):
curl http://localhost:8983/solr/col/query -d '
fl=id
&hl=on
&hl.fl=*
&q={!child of="type_s:parent"}type_s:parent AND content_txt:apache'

And here is the result:
{
...
"response":{"numFound":1,"start":0,"docs":[
{
"id":"1"}]
},
"highlighting":{
"1":{}}}


I was hoping to get this (=the doc 1 and highlight doc 2: the parent) :

{
...
"response":{"numFound":1,"start":0,"docs":[
{
"id":"1"}]
},
"highlighting":{
"2":{
"content_txt":["<em>apache</em>"]}}}


[1] http://lucene.472066.n3.nabble.com/Fwd-Standard-highlighting-doesn-t-work-for-Block-Join-td4260784.html
[2] http://lucene.472066.n3.nabble.com/highlighting-on-child-document-td4238236.html


Thanks by advance,