It is a library to compress and uncompress arrays of integers very fast. The assumption is that most (but not all) values in your array use less than 32 bits.
'me.lemire.integercompression:JavaFastPFOR:0.1.6'
<dependency>
<groupId>me.lemire.integercompression</groupId>
<artifactId>JavaFastPFOR</artifactId>
<version>0.1.6</version>
</dependency>
<dependency org="me.lemire.integercompression" name="JavaFastPFOR" rev="0.1.6"/>
"me.lemire.integercompression", "JavaFastPFOR", "0.1.6"