Spotlight is an indexing tool that listen to every file change and then index the file (eg: the name of the file, it's content if it is a text file or metadata of it's a picture...). This is not especially useful if you are a bit organized. Even worse, when you are creating a bunch a big files (like copying 2 gigabytes of RAW files to the picture folder) the amount of IO needed by spotlight prevents the mac from being used by an human, the swapfiles grows (even with 2Gb of system memory).
To remove this piece of crap, just follow this
how to.
