Add index creation on startup.

[mapedraza]

According to the Docker instructions, it is required to create 2 indexes on MongoDB

iotagent-json/docker/README.md

Lines 246 to 257 in 699b091

	```console
	docker exec <mongo-db-container-name> mongo --eval '
	conn = new Mongo();
	db = conn.getDB("iotagentjson");
	db.createCollection("devices");
	db.devices.createIndex({"_id.service": 1, "_id.id": 1, "_id.type": 1});
	db.devices.createIndex({"_id.type": 1});
	db.devices.createIndex({"_id.id": 1});
	db.createCollection("groups");
	db.groups.createIndex({"_id.resource": 1, "_id.apikey": 1, "_id.service": 1});
	db.groups.createIndex({"_id.type": 1});' > /dev/null
	```

It would be great if the IoTA could create them by itself (for example, at startup time).

It should check if collections are present and:

• If yes, check if the index already exists:
  • If yes, continue with normal execution
  • If no, try to creates the indexes
    • If succes, continues the normal execution
    • If fail, it should print an error log and continues the normal execution. This is really important because in some legacy installations, it could be present duplicated devices and fail to create the index. In that case, the IoTA should run as usual.

Not sure if it is part of the IoTA JSON or Library. Probably It can be addresed as part of the docker entrypoint, but also as part of the nodejs code.

[AlvaroVega]

This is done by iotagent-node-lib when collection does not exist (i.e. when is a new deploy from the scratch):

Groups:
https://github.com/telefonicaid/iotagent-node-lib/blob/53c57b6ebca382c6c278964495d175c3019b2ee4/lib/model/Group.js#L74
Devices:
https://github.com/telefonicaid/iotagent-node-lib/blob/53c57b6ebca382c6c278964495d175c3019b2ee4/lib/model/Device.js#L65

[mapedraza]

According to @AlvaroVega response, seems no further action should be taken. Keep the issue open until confirm in latest deployments the index is created

[AlvaroVega]

According to @AlvaroVega response, seems no further action should be taken. Keep the issue open until confirm in latest deployments the index is created

But just in new deployments!