I installed the plugin on my blog today itself and enabled the caching functionality. However within few hours I was warned by my host that the wp_relevanssi_cache was using around 1GB of Database space! I was shocked after reading that email.
The web host has specifically told me to deactivate the plugin and stay away from it as it looked 'messy'.
I was happy to finally find a true replacement of default wordpress search but then this happened.