What are docValues in Solr? When should I use them?

Question

So, I have read multiple sources that try to explain what \'docValues\' are in Solr, but I don\'t seem to understand when I should use them, especially in relation to indexed vs

Answer 1

Due to the way they are stored and accessed, they will speed up some operations, like sorting, faceting etc.

Besides, they are mandatory for using some features: streaming expressions, in place updates...

So, if in doubt:

1. if you don't have a big index, and size is not a problem, just enable them
2. if you do have a huge index, or indexing perf is critical, look into them more carefully and pick which fields to enable them on