your myindex/db folder should have folders named db as well as rb. In these bucket folders, metadata are stored in various files. It is not found in a folder like "myindex/db/metadata". There are files like bloomfilter, bucket_info.csv, Strings.data, Sources.data etc.
That's part of your metadata. And with a SF and RF of 2, you will be able to search all of your buckets when only one indexer goes down.