I think the name concept is fine, both internally and as a user-friendly name; it gets confusing when it's also involved in the path rendering for the FSDirectory: we could make it an explicit "path" property for that.
Since the introduction of {{IndexManager}} s the term index name has a dual meaning. Initially it was used to specify the actual directory name of a filesystem based index ({{FSDirectoryProvider}}). Now the term index name is used to identify a {{IndexManager}} for example within the {{IndexManagerHolder}}.
This leads to ambiguities. For example:
{...
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