Is it possible to search on the field name through wildcard?

[Miguel_BA (Miguel Barrios)]

you are right that it is a bad practice, and I have indicated to modify the JSON in the way as you have said, with unique fields. But the above documents are created and I am looking into how to fix it with Elasticsearch.
I have looked at the query_string with range function:

Query string with range

I'm having difficulties getting the this one right. What did I miss? { "query": { "query_string" : { "analyze_wildcard": true, "query" : "failed to add key to cache" }, "range": { "@timestamp": { "gte": "now-900s" } } } }

Do you think this function can help me?
Thanks for your answers