Hi, I would like to further understand indices in search db that have the word -suggest- in its name?

• What is the purpose of these indices?
• Why do they have a lower replication factor of 1 compared to other indices?
• Is it correct understanding these indices are not mandatory and dispensable? e.g.: if we lose a '-suggest-' index due to nodes being unavailable DataMiner carries on working with no data loss and new -suggest- index gets re-created.