Improve --replace-indexer message when redeploying an indexer

[Braqzen]

I had a service running in the docker container which did not include the --replace-indexer flag.

When I have altered an indexer and wanted to redeploy it I was presented with a message telling me to add the --replace-indexer flag but it did not tell me where to use it.

I have assumed that I was meant to replace

forc index deploy

with

forc index deploy --replace-indexer

but that was insufficient.

To fix the issue and redeploy the new version of the indexer I had to start the indexer service with that --replace--indexer flag in order for the flag in the deploy command to work.

Solution: replace the current message to inform the user that both the service and the deploy command must provide the --replace-indexer flag in order to redeploy an indexer under the same name.

[richardgreg]

Loud and clear.

When you initially run for index deploy after altering the service, the message should read Indexer({namespace}. {identifier}) already exists. Use --replace-indexer to re-start the indexer service and again during deployment.