NEW YORK — The New York Mets are moving struggling starter Kodai Senga to the bullpen, manager Carlos Mendoza said Wednesday, after the right-hander failed to fill a gaping hole in their thin rotation adequately.In seven starts this season, Senga owns a 10.08 ERA. Senga allowed seven earned runs, five walks and three hits while lasting just 3 2/3 innings against the Cubs on Tuesday, his second start since the Mets reinstated him from the injured list on June 16. Senga opened the season in the Mets’ rotation but carried a 9.00 ERA by the end of April, when he landed on the injured list. New York’s willingness to give him multiple starts upon a return underscores the poor state of its starting staff and depth behind it.Senga holds minor-league options, but per his contract, the Mets would need his consent to demote him.Senga told The Athletic on Wednesday that if the Mets were to ask him to accept a demotion, he would state his desire to remain in the major leagues.“It’s certainly the preference,” Senga said through interpreter Hiro Fujiwara. “Going down and throwing in minor-league games probably wouldn’t be as beneficial. Pitching in a high-concentration environment like the big leagues is what brings out the good and the bad. And when the bad comes out, that’s when you can finally learn versus when you’re pitching in the minor leagues. There’s just not as much to gain from those outings.”