HELP with understanding of query

[DenEs]

Hello, can you help me understand, why simple query not working.
I have a simple index with default settings:

PUT my_index/doc/1
{
  "path": "C:\\Windows\\system32\\cmd.exe"
}

Why the following query doesn't return anything?

GET my_index/_search
{
  "_source": "path", 
  "query": {
    "query_string": {
      "query": "(path: *\\system32\\*.exe)"
    }
  }
}

[polyfractal (Zachary Tong)]

It's likely a mismatch with how the document was analyzed, and how the query is being analyzed. I would use the Analyze API to see how the document is tokenized. You can then see how the query is tokenized with the Explain API and compare the two. Usually it becomes obvious how the two are analyzed differently and you can make corrections.

[DenEs]

I have checked analyzer and it gives standard output.

GET my_index/_analyze
{
  "text" : "C:\\Windows\\system32\\cmd.exe"
}

gives:

{
  "tokens": [
    {
      "token": "c",
      "start_offset": 0,
      "end_offset": 1,
      "type": "<ALPHANUM>",
      "position": 0
    },
    {
      "token": "windows",
      "start_offset": 3,
      "end_offset": 10,
      "type": "<ALPHANUM>",
      "position": 1
    },
    {
      "token": "system32",
      "start_offset": 11,
      "end_offset": 19,
      "type": "<ALPHANUM>",
      "position": 2
    },
    {
      "token": "cmd.exe",
      "start_offset": 20,
      "end_offset": 27,
      "type": "<ALPHANUM>",
      "position": 3
    }
  ]
}

Seems problem in escaping of star sign. "\" should be "\\"
Following query works as expected:

GET my_index/_search
{
  "_source": "path", 
  "query": {
    "query_string": {
      "query": "(path.keyword: *\\system32\\\\*.exe)"
    }
  }
}