rebalance exited with reason janitor_agent_servant_died

2017-09-14T19:21:56.447-07:00, ns_orchestrator:0:critical:message(ns_1@172.23.108.103) - Rebalance exited with reason {{janitor_agent_servant_died,

                               {{badmatch,{error,closed}},

                                {gen_server,call,

                                 ['ns_memcached-default',

                                  {get_mass_dcp_docs_estimate,

                                   [359,360,361,362,363,364,365,366,367,368,

                                    369,370,371,372,373,374,375,376,377,378,

                                    379,380,381,382,383,384,385,386,387,388,

                                    389,390,391,392,393,394,395,396,397,398,

                                    399,400,401,402,403,404,405,406,407,408,

                                    409,716,820,821,822,823,824,825,826,827,

                                    828,829,830,831,832,833,834,835,836,837,

                                    838,839,840,841,842,843,844,845,846,847,

                                    848,849,850,851,852,853,854,855,856,857,

                                    858,859,860,861,862,863,864,865,866,867,

                                    868,869,870,871,872,873,874,875,876,877,

                                    878,879,880,881,882,883,884,885,886,887,

                                    888,889,890,891,892,893,894,895,896,897,

                                    898,899,900,901,902,903,904,905,906,907,

                                    908,909,910,911,912,913,914,915,916,917,

                                    918,919,920,921,922,923,924,925,926,927,

                                    928,929,930,931,932,933,934,935,936,937,

                                    938,939,940,941,942,943,944,945,946,947,

                                    948,949,950,951,952,953,954,955,956,957,

                                    958,959,960,961,962,963,964,965,966,967,

                                    968,969,970,971,972,973,974,975,976,977,

                                    978,979,980,981,982,983,984,985,986,987,

                                    988,989,990,991,992,993,994,995,996,997,

                                    998,999,1000,1001,1002,1003,1004,1005,

                                    1006,1007,1008,1009,1010,1011,1012,1013,

                                    1014,1015,1016,1017,1018,1019,1020,1021,

                                    1022,1023]},

                                  360000]}}},

                              [{janitor_agent,get_servant_call_reply,1,

                                [{file,"src/janitor_agent.erl"},{line,493}]},

                               {janitor_agent,get_mass_dcp_docs_estimate,3,

                                [{file,"src/janitor_agent.erl"},{line,511}]},

                               {ns_rebalance_observer,

                                '-initiate_bucket_rebalance/2-fun-0-',2,

                                [{file,"src/ns_rebalance_observer.erl"},

                                 {line,188}]},

                               {async,'-async_init/3-fun-0-',3,

                                [{file,"src/async.erl"},{line,131}]}]}