Update fields of a doc from another doc according to key field

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1

Hello,

I have one type of doc. Each doc has a filled field, "guid". And on some of the docs the field "operationName" is filled, any on the others this field is empty. I need to update this empty "operationName" field according to "guid" field. How can I update this field, or relate this docs ?

doc type 1:

{
guid : 100
operationName : "operation1"
}

doc type 2 :
{
guid : 100
operationName :
}

Thank you.

2

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