Add iterations/job specifics to metadata posted to elasticsearch

[paigerube14]

It would be nice to be able to add iterations or the file used for ingress-perf to not have to search through other indexes to find this data when comparing results

Should be added as part of the json file here:

e2e-benchmarking/utils/index.sh

Line 59 in 715f12a

json_data='{

[paigerube14]

This should be PODS_PER_NODE for node-density/heavy as well