How to show fild's contain throught connector log

[Tortoise]

Hello @Dariia_Hrebenichenko

Welcome to the community.

This will return all the values of filename as per the records which qualify your rule

{
  "filename": "{{#context.hits}} {{_source.filename}} {{/context.hits}}"
}

If you just want to display the first value :

{
  "filename": "{{context.hits.0._source.filename}}"
}

Thanks!!