Say I’m doing document retrieval on a large batch of docs, and I’m using KNN to 
predict topics. I noticed however I struggled a bit to look back at the 
original text documents based on the numerical results only: I had to use some 
hashing tricks which weren’t optimal. Is it possible to request a feature in 
Flink to allow for vectors to have labels (e.g. key, ID etc.)?  Any hacks or 
workarounds for this problem? Appending the vectors won’t work either since ML 
algos will complain. 
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