code: public void setLocationEngineRequest(@NonNull LocationEngineRequest locationEngineRequest) {
      this.locationEngineRequest = locationEngineRequest;
  
      if (isServiceAvailable()) {
        navigationService.updateLocationEngineRequest(locationEngineRequest);
      }
    }
docs: This method updates the {@link LocationEngineRequest} that is used with the {@link LocationEngine}.
  <p>
  If a request is not provided via {@link MapboxNavigation#setLocationEngineRequest(LocationEngineRequest)},
  a default will be provided with optimized settings for navigation.
  </p>
  <p>
  This method can be called during an active navigation session.  The active {@link LocationEngineRequest} will be
  replaced and the new one (passed via this method) will be activated with the current {@link LocationEngine}.
  </p>
  
  @param locationEngineRequest to be used with the current {@link LocationEngine}