Relative pronouns

Relative pronouns "that," "which," and "who" serve distinct functions in sentences, introducing essential and nonessential clauses, and referring to people respectively.

"That", "which", and "who" are relative pronouns and don't all mean the same thing.

That

"That" introduces an essential clause. If you remove the words after "that", the sentence doesn't make sense.
Do this

For HDFS working directory, provide the path in HDFS that you want Hunk to use as a working directory.

Which

"Which" introduces a nonessential clause. If you remove the words after "which", the sentence still makes sense, although it is less detailed.
Do this

Splunk Enterprise changes one of the default port settings in the server.conf file, which is one of the stanzas you copied but didn't edit.

Who

When referring to a person, use "who" instead of "that".