Entity matching happens in your transformation step. If you want to use acronyms then "EL" is done by Meltano, the T of ELT is after meltano has loaded your data. You can use any tool you want, some folks use DBT, you can use Pandas, Java, you name it. Really not a meltano specific question as Meltano will get the data loaded for you (and we could run an Entity matching tool for you) but 🤷 hope that helps