How to extract string from JSON string using painless script

Elastic Stack Elasticsearch
1

Hi team,

script:

if(doc['charstream.keyword'].size() == 0){
     return "null"
} else{
    String[] parts = /\|/.split(doc['charstream.keyword'].value);
    return parts[4];
}

Message string:

"charstream": "Content-Type: application/json\r\nIXC-Client-API-Type: REST-XML/HTTP\r\n\r\n{\"api_version\":\"1.2.0\",\"response_id\":\"BEFC9B92-F8C7-11EA-96EA-7F0001010000\",\"response_datetime\":\"2020-09-17T14:55:37.462+05:30\",\"request_id\":\"CD758BDD-C0A4-48AC-AF5D-BBD89646D196\",\"request_datetime\":\"2020-09-17T14:55:37.404+05:30\",\"sender_system_id\":\"Profunds\",\"sender_system_user_id\":\"abc@xyz.com\",\"request_priority\":\"3\",\"test_indicator\":\"false\",\"client_code\":\"ACMEX\",\"virtual_account_number\":\"****\",\"transaction_amount\":\"****\",\"currency_code\":\"INR\",\"payment_mode\":\"****\",\"transaction_id\":\"****\",\"transaction_id_type\":\"UTR\",\"transaction_datetime\":\"2020-09-17T14:50:27.404\",\"sender_name\":\"****\",\"sender_mobile_communication_number\":\"****\",\"sender_account_number\":\"****\",\"sender_bank_name\":\"****\",\"sender_ifsc_code\":\"****\",\"client_account_name\":\"****\",\"client_mobile_communication_number\":\"****\",\"client_account_number\":\"****\",\"client_bank_name\":\"****\",\"client_ifsc_code\":\"****\",\"narration_1\":\"Narration 1\",\"narration_2\":\"Narration 2\",\"informational_message\":\"A quick brown fox jumped over the lazy dog !\",\"completion_code\":0,\"reason_code\":\"XC00441I\",\"message\":\"Client has confirmed this transaction to be a valid one.\",\"client_data_ext\":{\"response_id\":\"727C43C3-8A4B-45CD-ABF2-5FFF564A9C77\",\"response_datetime\":\"2020-09-17T09:25:37.447Z\"}}"

output is:

[
{
  "_id": "6doI03YBCWsN2ibkTlAi",
  "amount": [
   "null"
  ]
 },
 {
  "_id": "ebH-HncBYnsBpTq8Oub_",
  "amount": [
   "null"
  ]
 }
]

I need following fields from above JSON string:

  1. transaction_amount
  2. sender_name
  3. virtual_account_number
  4. sender_account_number

Can anyone has solution ?

Thanks

2

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