Chaining queries across multiple types

Elastic Stack Elasticsearch
1

I have following application.

Product (document of _type : product) belongs to Category (document of
_type : category) . User (document of _type : user) can own these
products under any categories. 1 product can be under more than one
category. couple of ways of storing the product/category in user doc

Requirement

When consumer type keywords (they could type products or categories) in an
open text field, I need to find users who own these products/categories
(based on the keywords typed)

Model structure

Product

{
" _id" : "p100",
"_type" : "product",
"name" : "camera"
"categories" :["c100","c110"]
}

Category

{
" _id" : "c100",
"_type" : "category",
"name" : "electronics"
}

{
" _id" : "c110",
"_type" : "category",
"name" : "baby"
}

approach 1 for user doc

Storing in denormalized form product , category name itself in the

{
" _id" : "<user_id>",
"name" : "John Smith",
"product_categories" :[
{
"product" : "tv",
"category" : "electronics"
},
{
"product" : "camera",
"category" : "electronics"
}
]
}

{
" _id" : "<user_id>",
"name" : "Jane Smith",
"product_categories" :[
{
"product" : "camera",
"category" : "baby"
}
]
}

approach 2 for user doc

Storing in normalized form with product id , category id .

{
" _id" : "<user_id>",
"name" : "John Smith",
"product_categories" :[
{
"product" : "p100",
"category" : "c100"
}
]
}

{
" _id" : "<user_id>",
"name" : "Jane Smith",
"product_categories" :[
{
"product" : "p100",
"category" : "c110"
}
]
}

Approach advantages and disadvantages

Approach #1

advantage

  • Possibly one query can achieve getting list of users with search text
    as "camera baby"

disadvantage

  • If ever we change product name "camera" or category name "baby" we
    will have a hell updating all the documents with these product and category
    names.

Approach #2

advantage

  • If ever we change product name "camera" or category name "baby" , we
    just change the name in product and category documents and all users are
    still related to the new names with product id and category id in the user
    documents

disadvantage

  • we will have to do MORE THAN 1 query to list of users with search
    text as "camera baby"

So when someone searches

  • "camera electronics" - john smith should show up in search result

  • "camera baby" - jane smith should show up in search result

  • "camera" - john smith and jane smith should show up in search

result

Million $ question

Assuming I decided to go with approach #2 . How do I achieve this query in
Elasticsearch ?

My approach

  1. Fire first query against elastic search on MULTIPLE TYPES ( product
    and category type index) with term "camera baby" . Which will return
    documents matching different types.
  2. Group document ids based on types (application side work)
  3. Fire second query against elastic search on a *USER TYPE index *with
    respective ids obtained from step 2.

So the question is ....

  1. Is it even possible to fire "camera baby" query against multiple
    types under same index in elastic search (remember Im doing this since
    when someone enters "camera baby" we don't know if each term is a product
    or a category ? )
  2. Is there any way to chain query in step1 and step3 without grouping
    ids on the application side ?
  3. Is there any better way to achieve what I'm doing ( in terms
    model/query/id mapping etc) above in elastic search assuming I want to
    retain single place to change product /category names so that its
    automatically reflected to all users who own those products in specific
    category?

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