Searching Parent and Child Documents together as one document?

Elastic Stack Elasticsearch
1

Hi

I have this scenario of discussion board where people create discussion
thread called post. Other can comment on it called comment. Now comment i
same as post except it as parentId stored in it. In other words, my
database schema for post table is

Post

PostId, PostSubjectId, PostTitle, PostData, PostKind, PostDate

*PostSubjectId *is *PostId *of some post which is parent to the post and is
null for parent post.

*Postkind *is a enum value which says *Post *for parent post and *Comment *for
child posts.

Now, I have stored this document in elasticsearch with help of _id,
_routing and _parent mapping I have mapped ids and parent ids
appropriately. My mapping looks like:

PUT search
{
"mappings": {
"post":{
"_id": {
"path": "postid"
},
"_routing": {
"path": "postsubjectid",
"required":false
},
"_parent" : {
"type" : "post"
},
"properties": {
"postid": {
"type": "long"
},
"postsubjectid": {
"type": "long"
},
"posttitle":{
"type": "string",
"index": "analyzed"
},
"postdata":{
"type": "string",
"index": "analyzed"
},
"postdate":{
"type": "date",
"format": "date_hour_minute_second_millis"
},
"postkind": {
"type": "string",
"index": "not_analyzed",
"omit_norms": true,
"index_options": "docs"
}
}
}
}
}

Every parent post can have multiple comments/child posts. Parent Posts
along with comments ordered by PostDate is called a discussion and shown as
discussion on user interface. We need to implement search on discussions.

I want to write a query which search across discussions not posts and
return me parent posts when either parent post or child post has a search
hit. I can think of has_child clause but am confused while creating this
query as it includes both searching in parent as well as child together.

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2

we are also interested in a similar concept. We want to be able to search parent and it's children as if they were one document. note, that nested-document solution is not going to work for us as we can have many children and size can be an issue since nested documents must be sent as ONE document

@Udit_Narayan: let us know if you have a solution