How to replace some text in textbox of docx document using Apache POI?

Question

I'm able to get text of textboxes using code described in answer of How to get text from textbox of MS word document using Apache POI?

But i found no way to edit text in a textbox for example to replace some placeholders. Iterate over runs of embeddedPara and setText() does not work. Im using apache poi 3.13.