'Kibana Elastic search - Cannot search text containing -1

On Kibana Elastic search, we want to look for all occurrences containing the text "ReturnCode":"-1"

We are using the following Query DSL : Query DSL

The query is returning both the following : (1) "ReturnCode":"1" (2) "ReturnCode":"-1"

We would like to list only "ReturnCode":"-1"

Grateful for some advises to achieve this.

Thanks



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