How to convert case at runtime at search query in kibana

Elastic Stack Kibana
4

A few small changes, does this work for you?

GET /hist_latest_5.5.0/_search
{
  "query": {
    "bool": {
      "must": [{
        "script": {
          "script": "doc['bank_client_entity_name'].value.toUpperCase() == 'SHELL TREASURY CENTRE LIMITED'"
        }
      }]
    }
  }
}