How to update value of specific embedded document, inside an array, of a specific document in MongoDB?

Question

I have the following structure in my document:

{
  _id : ObjectId("43jh4j343j4j"), 
  array : [
            { 
              _arrayId : ObjectId("dsd87dsa9d87s9d7"),
              someField : "something",
              someField2 : "something2"
            },
            { 
              _arrayId : ObjectId("sds9a0d9da0d9sa0"),
              someField : "somethingElse",
              someField2 : "somethingElse2"
            }
   ]
 }

I want to update someField and someField2 but only for one of the items in the array, the one that matches _arrayId (e.g. _arrayId : ObjectId("dsd87dsa9d87s9d7"); and only for this document (e.g. _id : ObjectId("43jh4j343j4j") ) and no other.

The arrayIds are not unique to the document that's why I need it to be for a specific document. I could use the $ positional operator if I wanted to update that value within the array for every document it exists in, but that's not what I want.

I am trying to accomplish this in java but a command line solution would work as well.