The 'cursor' option is required, except for aggregate with the explain argument

[cchigoriwa]

OpenHIM throws Transaction Load Error: -1 null

MongoDB version 3.6.0

See the following log for more details:

2018-01-04T09:05:34.772Z - debug: [worker1] Called getMetrics(false, hour, undefined)
2018-01-04T09:05:34.774Z - debug: [worker1] Metrics query object: {"endDate":"2018-01-04T11:05:34+02:00","startDate":"2018-01-03T11:05:34+02:00"}

MongoError: The 'cursor' option is required, except for aggregate with the explain argument
at Function.MongoError.create (/usr/lib/node_modules/openhim-core/node_modules/mongoose/node_modules/mongodb-core/lib/error.js:31:11)
at /usr/lib/node_modules/openhim-core/node_modules/mongoose/node_modules/mongodb-core/lib/connection/pool.js:462:72
at authenticateStragglers (/usr/lib/node_modules/openhim-core/node_modules/mongoose/node_modules/mongodb-core/lib/connection/pool.js:410:16)
at Connection.messageHandler (/usr/lib/node_modules/openhim-core/node_modules/mongoose/node_modules/mongodb-core/lib/connection/pool.js:444:5)
at Socket. (/usr/lib/node_modules/openhim-core/node_modules/mongoose/node_modules/mongodb-core/lib/connection/connection.js:306:22)
at Socket.emit (events.js:159:13)
at addChunk (_stream_readable.js:265:12)
at readableAddChunk (_stream_readable.js:252:11)
at Socket.Readable.push (_stream_readable.js:209:10)
at TCP.onread (net.js:608:20)

2018-01-04T09:05:34.819Z - debug: [worker1] Called getMetrics(true, undefined, undefined)
2018-01-04T09:05:34.821Z - debug: [worker1] Metrics query object: {"endDate":"2018-01-04T11:05:34+02:00","startDate":"2018-01-03T11:05:34+02:00"}

MongoError: The 'cursor' option is required, except for aggregate with the explain argument
at Function.MongoError.create (/usr/lib/node_modules/openhim-core/node_modules/mongoose/node_modules/mongodb-core/lib/error.js:31:11)
at /usr/lib/node_modules/openhim-core/node_modules/mongoose/node_modules/mongodb-core/lib/connection/pool.js:462:72
at authenticateStragglers (/usr/lib/node_modules/openhim-core/node_modules/mongoose/node_modules/mongodb-core/lib/connection/pool.js:410:16)
at Connection.messageHandler (/usr/lib/node_modules/openhim-core/node_modules/mongoose/node_modules/mongodb-core/lib/connection/pool.js:444:5)
at Socket. (/usr/lib/node_modules/openhim-core/node_modules/mongoose/node_modules/mongodb-core/lib/connection/connection.js:306:22)
at Socket.emit (events.js:159:13)
at addChunk (_stream_readable.js:265:12)
at readableAddChunk (_stream_readable.js:252:11)
at Socket.Readable.push (_stream_readable.js:209:10)
at TCP.onread (net.js:608:20)