mongodb突然停止，并显示以下错误日志。
2018-12-27T07:26:33.336+0000 F - [conn443555] Invariant failure Hit a MONGO_UNREACHABLE! src/mongo/db/query/collation/collation_spec.cpp 75
2018-12-27T07:26:33.336+0000 F - [conn443555]
2018-12-27T07:26:33.419+0000 F - [conn443555] Got signal: 6 (Aborted).