How can I custom a SortParser in es?

hi~ all:
I have a Issue about how to do a customer scorer in es, i see
the es guide about score script or do some score function in query, but my
question is that my score is not in my lucene index fields, we have a
external Argorithm Program that caculate our item score, then , i want add
a timer plugin in es, pull the scores from the Argorithm Program every 5
min. so, in this scene, should i extends a SortParser in es and write a
plugin ? and how .... ? is there a plugin example like this scene?

      thanks for help!

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