fix(opensearch): handle index not present errors in search api

[lsampras]

Currently in the self deployment mode we rely on fluentd to automatically create the index,

in this case when we spin up the local setup the msearch API errors out since the index is not present,
with the following json response

{
  "took": 17,
  "responses": [
    {
      "took": 15,
      "timed_out": false,
      "_shards": {
        "total": 1,
        "successful": 1,
        "skipped": 0,
        "failed": 0
      },
      "hits": {
        "total": {
          "value": 0,
          "relation": "eq"
        },
        "max_score": null,
        "hits": []
      },
      "status": 200
    },
    {
      "took": 12,
      "timed_out": false,
      "_shards": {
        "total": 1,
        "successful": 1,
        "skipped": 0,
        "failed": 0
      },
      "hits": {
        "total": {
          "value": 0,
          "relation": "eq"
        },
        "max_score": null,
        "hits": []
      },
      "status": 200
    },
    {
      "error": {
        "root_cause": [
          {
            "type": "index_not_found_exception",
            "reason": "no such index [hyperswitch-refund-events]",
            "index": "hyperswitch-refund-events",
            "resource.id": "hyperswitch-refund-events",
            "resource.type": "index_or_alias",
            "index_uuid": "_na_"
          }
        ],
        "type": "index_not_found_exception",
        "reason": "no such index [hyperswitch-refund-events]",
        "index": "hyperswitch-refund-events",
        "resource.id": "hyperswitch-refund-events",
        "resource.type": "index_or_alias",
        "index_uuid": "_na_"
      },
      "status": 404
    },
    {
      "error": {
        "root_cause": [
          {
            "type": "index_not_found_exception",
            "reason": "no such index [hyperswitch-dispute-events]",
            "index": "hyperswitch-dispute-events",
            "resource.id": "hyperswitch-dispute-events",
            "resource.type": "index_or_alias",
            "index_uuid": "_na_"
          }
        ],
        "type": "index_not_found_exception",
        "reason": "no such index [hyperswitch-dispute-events]",
        "index": "hyperswitch-dispute-events",
        "resource.id": "hyperswitch-dispute-events",
        "resource.type": "index_or_alias",
        "index_uuid": "_na_"
      },
      "status": 404
    }
  ]
}

In this case it would be better if we treat missing index as 0 hits and log the corresponding errors.