documentalist vs documentary writer

Some examples from the web:

• Clerk; documentalist; technician; IT operative
• Junior clerk; junior documentalist; junior technician, junior IT operative
• Ms Fayl held various positions as a documentalist in several European countries, the latest from 1988 to 1995 setting up and running the documentation service in the European Commission Delegation in Norway.
• Senior clerk; senior documentalist; senior technician; senior IT operative
• Junior clerk; junior documentalist; junior technician, junior IT operative
• This Directorate-General, which has nearly 100 members of staff, has a large law library under the responsibility of a director and a team of researchers and documentalists currently grouped within four units, one of which is responsible for legal information technology.
• working with television, multimedia and radio and photo professionals (producers, journalists, documentalists etc.) to provide images adapted to their needs and providing production teams with archive images,

Some examples from the web:

• I found my new documentary subject.
• Maybe after this documentary on garbage.
• CBS is looking for documentary subjects.
• Mr Fullerton's provided much vivid documentary evidence.
• Since she started shooting that documentary.
• Because there's a Miles Davis documentary...
• Our first assignment is a documentary.
• Condoleezza Rice refused to be interviewed for this documentary.
• I stumbled across a compelling documentary about them.
• It's a documentary I directed.
• Additional documentary evidence may be required.
• This appropriation also covers the cost of maintaining documentary software.
• This argument was not substantiated by any documentary evidence.
• Your award-winning documentary was a complete phony.
• Validation agents shall time-stamp documentary evidence upon receipt.
• Something about this writer that bothers me.
• Maybe Hester's an artist writer.
• Just when a writer might need inspiration.
• But first novel by an unknown writer...
• Greek writer known as the father of history.