B787 First Officer reported a flight deck window shattered in cruise. Flight crew diverted to nearest suitable airport and landed.

Narrative

FWD R Window ShatteredAbout 5-10 minutes after crew change; approx a few hours into the flight; I was flying as PM (Pilot Monitoring) in the FO (First Officer) seat. I had moved my seat forward and up to better take a look at the stars. It was then I noticed a bright pinprick of reddish orange light in the lower right corner of the forward window. It was transient; like you would see after you blew out a candle; the lingering orange glow on the tip of the wick. I mentioned it to the Relief Captain but he thought I was talking about something outside. By then; the light had disappeared. I leaned even closer and another sunset colored pinprick of light appeared; also fading quickly. If I hadn't moved my seat closer originally to better look outside; I doubt I would ever have noticed these tiny lights. (If this was arcing; which it clearly must have been; it was nothing that I pictured 'arcing' to look like. I expected something far more dramatic.) The Captain and I considered and then discarded the idea of St Elmo's fire. Then for a third time the very tiny red-orange light appeared in the lower right corner of the window; followed quickly by a second light. Just as I verbalized 'now there's two--' there was a LOUD explosive bang and the window shattered. It was a definite startle event especially with my face so close to the glass.Things happened quickly from here but with measured efficiency and excellent communication and teamwork: There was an EICAS message Window Heat Fwd R. Captain verbalized that we might [have] to divert.We discussed quickly that ZZZ was an hour behind us and that it was probably the best option; as we didn't know the window's integrity. It was very badly shattered and it was hard to tell if it was warped or not. I smelled a faint burning odor but heard no unusual air noise. As the Captain began a left turn and a descent to 500 ft below our cruising altitude; all of this being discussed between us; I got the exterior lights on and got ready to transmit on guard as the Captain tried unsuccessfully to reach ZZZ. I then broadcast on Guard our actions and intentions and made the [request for priority handling] call. In retrospect; I should have [notified ATC]; as the window was holding and the jet was pressurized. I asked in the blind if any other aircraft could contact ZZZ radio and have them contact us. I rang the bunk room to wake the Captain. I dialed XX but that was the Captain on IOE not the LCP (Line Check Pilot) in charge of the fight. Explained briefly what happened; what we were doing; and summoned them back to the flight deck. (note: They couldn't have been in the bunk for very long when this occurred; in fact; I don't think the LCP had even climbed into the bull yet. This happened that *fast* after changeover. An awkward time of flight but handled well by us; I feel; nonetheless.) I can't recall if the Captain or I got the HF frequency in but shortly after; we received a SelCal; which I answered. I relayed the situation and our intentions to ZZZ; an initial descent at 280 knots was begun; and navigation instructions given. Ran the non-normal checklist for Window Heat FWD R which directs to the Window Damage checklist. As the structure of the window wasn't fully known; the checklist leads to the advisement to land at the nearest suitable airport; in this case; ZZZ. Once the LCP was back on the flight deck; the decision was made for the Relief Captain to continue flying as he was rested; and the LCP then switched places with me. (Good call--this was the wisest arrangement to mitigate rest and fatigue issues that were impacting this situation.) The trainee Captain on IOE took the center Relief seat and I the right to provide back up. The fuel jettison checklist was accomplished. The FA's (Flight Attendants) and passengers were briefed. The descent and approach into ZZZ was smooth and uneventful. We landed and taxied to the gate.