I hate to disagree, below quote is not such good advice. Your bonus will be taxed at time of payment (tax rate minimum 22% in 2019) and you WILL be responsible for paying the entire PRETAX amount back.
The 5k will be yours to keep after passing IOE (that is the length of that contractual obligation). The 27K or whatever the exact amount is yours to keep in it’s entirety after 24 months). In Indoc, you have the opportunity to defer receiving the payments until earned (approximately 3K per month to be paid during each of months 13 through 24 and the 5K after finishing IOE). No mystery, nothing is hidden. Make your decision and sign the papers. It’s all very straight forward if you are paying attention, which is admittedly very difficult to catch everything in that whirlwind of week one. Oh, yes, the bonus is contractually obligated to be paid to you, it won’t disappear, regardless of what future new hires do or don’t get.
PS take a picture of your paperwork for your records.