To have DITA2Go include index terms in RTF output:
[WordOptions]
; Index = Standard (Word index markers), or None
Index=Standard
When Index=Standard, DITA2Go creates a Word {xe} field for each <indexterm>. To generate an index from these fields in Word, see §15.1.4 Including or excluding contents and index for RTF output.
Note: Word uses the character formatting in effect at the {xe} field itself for the entire index item. To avoid unwanted formatting, place index markers at the very end of a paragraph. (Or at the very beginning; though if the paragraph format itself includes bold or italic, those effects will apply to the index item.)
When Index=None, Word {xe} fields are not created.
See also” type index references are not supported by Word index generation. However, when you specify Index=Standard you can direct DITA2Go to refrain from converting see-also index entries to Word {xe} fields:
[WordOptions]
; NoSeeAlso = No (default, keep See Also markers)
; or Yes (remove them)
NoSeeAlso=Yes
When NoSeeAlso=No, see-also index entries are converted to {xe} fields in RTF output files.
When NoSeeAlso=Yes, see-also index entries are not converted to {xe} fields in RTF output.
§15.1.4 Including or excluding contents and index for RTF output