indexes.js

db.model_versions.getIndexes()
db.model_versions.createIndex(
  {
    "modelId.value": 1,
    "metadata.created": -1
  }
)
db.model_versions.getIndexes()

db.model_versions.getIndexes()
db.model_versions.createIndex(
  {
    "projectId": 1,
    "metadata.created": -1
  }
)
db.model_versions.getIndexes()

db.model_audit_log_entries.getIndexes()
db.model_audit_log_entries.createIndex(
  {
    "modelId.value": -1,
    "timestamp": -1
  }
)
db.model_audit_log_entries.getIndexes()

db.sagas.createIndex({
			"sagaName" : 1,
			"subject" : 1,
			"version" : 1,
			"started" : -1
		})

db.model_versions.getIndexes()
db.model_versions.createIndex(
{
"modelId.value": 1,
"metadata.created": -1
}
)
db.model_versions.getIndexes()

db.model_versions.getIndexes()
db.model_versions.createIndex(
{
"projectId": 1,
"metadata.created": -1
}
)
db.model_versions.getIndexes()

db.model_audit_log_entries.getIndexes()
db.model_audit_log_entries.createIndex(
{
"modelId.value": -1,
"timestamp": -1
}
)
db.model_audit_log_entries.getIndexes()

Thanks @zaching i've integrated your changes to the gist