How to query with multiple languages (field per language approach)?

queries.sh

#!/bin/sh

# 1. No results?
echo "Search 1: text: _all: topic - no results?"
curl -XPOST 'localhost:9200/testing/_search?pretty=true' -d '
{
  "query": {
    "text": {
      "_all": "topic"
    }
  }
}'
echo;echo

# 2. OK as expected
echo "Search 2: fields[titles eng fin ger, _all] AND-query: topic"
curl -XPOST 'localhost:9200/testing/_search?pretty=true' -d '
{
  "query": {
    "query_string": {
      "fields": [
        "title_eng",
        "title_fin",
        "title_ger",
        "_all"
      ],
      "default_operator": "AND",
      "query": "topic"
    }
  }
}'
echo;echo

# 3. No results, why?
echo "Search 3: fields[titles eng fin ger, _all], AND-query: topics on vagueness"
curl -XPOST 'localhost:9200/testing/_search?pretty=true' -d '
{
  "query": {
    "query_string": {
      "fields": [
        "title_eng",
        "title_fin",
        "title_ger",
        "_all"
      ],
      "default_operator": "AND",
      "query": "topics on vagueness"
    }
  }
}'
echo;echo

# 4. works
echo "Search 4: like 3 but with dis_max instead of query_string"
curl -XPOST 'localhost:9200/testing/_search?pretty=true' -d '
{
  "query": {
    "dis_max": {
      "queries": [
        {
          "text": {
            "_all": {
              "query": "topics on vagueness",
              "operator": "and"
            }
          }
        },
        {
          "text": {
            "title_eng": {
              "query": "topics on vagueness",
              "operator": "and"
            }
          }
        },
        {
          "text": {
            "title_fin": {
              "query": "topics on vagueness",
              "operator": "and"
            }
          }
        },
        {
          "text": {
            "title_ger": {
              "query": "topics on vagueness",
              "operator": "and"
            }
          }
        }
      ]
    }
  }
}'
echo;echo

setup.sh

#!/bin/sh

# setup
echo "create index with mapping"
curl -XPOST 'localhost:9200/testing?pretty=true' -d '
{
  "mappings": {
    "record": {
      "properties": {
        "title": {
          "type": "string",
          "index": "analyzed",
          "boost": "2.0"
        },
        "title_eng": {
          "type": "string",
          "index": "analyzed",
          "analyzer": "english"
        },
        "title_fin": {
          "type": "string",
          "index": "analyzed",
          "analyzer": "finnish"
        },
        "title_ger": {
          "type": "string",
          "index": "analyzed",
          "analyzer": "german"
        }
      }
    }
  }
}'
echo;echo
echo "post test data"
curl -XPOST 'http://localhost:9200/testing/record?pretty=true' -d '{
  "title": "Topics on Vagueness",
  "title_eng": "Topics on Vagueness"
}'