Test speed of Lucene 8 vs Lucene 4 id lookups using DocValuesTermsQuery.

Lucene 8

1000000 docs

Indexing start string Indexing complete string search string complete in 9.713112046 secs

Indexing start numeric Indexing complete numeric search numeric complete in 0.441230859 secs

Lucene 4

1000000 docs

Indexing start string Indexing complete string search string complete in 4.7344909 secs

Indexing start numeric Indexing complete numeric

org.opentest4j.AssertionFailedError: (Numerics dont work with Terms Filter)

Take away

Lucene 8 numeric lookups are much faster!
Lucene 8 string lookup is twice as slow as Lucene 4.