I am using Elastic 6.1+
I have created an index and added some values to it, the index mapping is text and numbers.

I want to create a multi_match on all of the fields in the index, query a text or a number and get the results back.
Also i would like to define that the score of field1 on the index is boosted

For some reason once i add the fields array it only search on that fields (added it in order to be able to define which field i want to boost and how much) and if i add to the fields array the “*” as field it return an error.

GET MyIndex/_search
  "query": {
    "multi_match": {
      "query": "test1",
      "fields": [

Thank you

Apparently adding
“lenient”: true
to the query solved the problem