How to concatenate a string and a numeric field in Data Prepper value_expression

Data Prepper
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1

Versions (relevant - OpenSearch/Dashboard/Server OS/Browser):
OpenSearch Data Prepper 2.12.2

Describe the issue:

Hi everyone — I’m trying to concatenate a literal string with a numeric field inside a Data Prepper add_entries (mutate_event) value_expression, but my attempts keep failing. Example of what I tried:

Configuration:

- add_entries:
    entries:
      - key: "/payload/text_for_embedding"
        value_expression: ' "Parking Lots: " + /payload/property/parkingLots '

That obviously doesn’t work. What is the correct way?

This example not success.
Thanks

Relevant Logs or Screenshots:

2

@krishnap Can you try the format option:

- add_entries:
        entries:
          - key: "/payload/text_for_embedding_fmt"
            format: "Parking Lots: ${/payload/property/parkingLots}"

Or this should also work for you:

- add_entries:
        entries:
          - key: "/payload/text_for_embedding_expr"
            value_expression: "\"Parking Lots: \" + /payload/property/parkingLots"