Exporter stores multiple operators with the same index

[amirylm]

e.g.

{
  "publicKey": "...",
  "name": "genesis4",
  "ownerAddress": "...",
  "index": 1
},
{
  "publicKey": "...",
  "name": "genesis2",
  "ownerAddress": "...",
  "index": 1
}