`filter` and `filterIndex` names are confusing

filter and filterIndex are two optic combinators with similar name and behaviour but different types, which may be confusing.

val siblings: Lens[User, List[String]] = ...

siblings.get(user) 
// res: List[String] = List( "Zoe", "Jo", "Eda")

// select list with more than two elements
siblings.filter(_.length > 2).getOption(user)
// res: Option[List[String]] = Some(List( "Zoe", "Jo", "Eda"))

// select names with more than two characters
siblings.each.filter(_.length > 2).getAll(user)
// res: List[String] = List( "Zoe", "Eda")

// select all names except the first (index == 0 means head)
siblings.filterIndex(_ >= 1).getAll(user)
// res: List[String] = List("Jo", "Eda")

It may be easier to see the confusion when we check the type of filter and filterIndex for List

filter     (predicate): Optional [List[A], List[A]]
filterIndex(predicate): Traversal[List[A], A]

Start by locating the definitions and usages of the Scala optic combinators filter and filterIndex, then review the existing comment discussion before proposing a direction. Done requires an agreed naming change or documented decision that resolves the confusion between their types and behavior.