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我想在我的 mongodb 集合中搜索一个字符串，并且搜索字符串存在于另一个集合中，该集合作为我当前集合中的对象数组连接。

示例集合集合 1：

_id:5ec6e9387bfec30017036b0d
mrthodType:"POST"
active:true
requestContentType:"JSON"
responseContentType:"JSON"
title:"Refund Amount"
usecase:"To refund amount."
slug:"refund-transaction"
requestHead:Array
   0:Object
      _id:5ec772da29bf5800177665dd
      kind:"Collection2"
      ref:5ec6e9387bfec30017036b0e
   1:Object
   2:Object
   3:Object
   4:Object
requestBody:Array
responseHead:Array
responseBody:Array
responseDetails:Array
endpoints:Array
codeSnippets:Array
responseCode:Array
seo:Array
createdAt:2020-05-21T20:48:56.715+00:00
updatedAt:2020-05-22T06:36:25.120+00:00
__v:1

收藏2：

_id:5ec6e9387bfec30017036b0e
requirement:"optional"
datatype:"string"
name:"version"
example:"**Example**: v1"
object:Array
createdAt:2020-05-21T20:48:56.932+00:00
updatedAt:2020-05-22T06:36:20.874+00:00
__v:0
parameter:5ec6e3934713700017f64fa4

我想搜索collection1，它也可以返回collection2中的结果

例如：搜索 'version' 结果应该返回 collection1->requestHead[0]

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