Incorrect field values returned when '.' (dot) used in property name

[danielcweeks]

If two properties in a document have the same prefix up to a '.' (dot/period), then queries for the fields that include the '.' will return the same value as the prefix without.

#Delete Test Index
curl -XDELETE localhost:9200/test

#Create a document with property names similar up to a '.'
curl -XPUT http://localhost:9200/test/test/1 -d '
{
  "foo" : "val",
  "foo.bar" : "val_WILL_NOT_SHOW",
  "foo.bat" : "val_THIS_EITHER"
}'

#Query for specific fields and note the incorrect values
curl -XGET 'http://localhost:9200/test/test/_search?q=val&pretty&fields=foo,foo.bar,foo.bat'
{
  "took" : 2,
  "timed_out" : false,
  "_shards" : {
    "total" : 5,
    "successful" : 5,
    "failed" : 0
  },
  "hits" : {
    "total" : 1,
    "max_score" : 0.15342641,
    "hits" : [ {
      "_index" : "test",
      "_type" : "test",
      "_id" : "1",
      "_score" : 0.15342641,
      "fields" : {
        "foo.bat" : [ "val" ],
        "foo.bar" : [ "val" ],
        "foo" : [ "val" ]
      }
    } ]
  }
}

#Same query with no fields specified
curl -XGET 'http://localhost:9200/test/test/_search?q=val&pretty'
{
  "took" : 2,
  "timed_out" : false,
  "_shards" : {
    "total" : 5,
    "successful" : 5,
    "failed" : 0
  },
  "hits" : {
    "total" : 1,
    "max_score" : 0.15342641,
    "hits" : [ {
      "_index" : "test",
      "_type" : "test",
      "_id" : "1",
      "_score" : 0.15342641,
      "_source":
{
  "foo" : "val",
  "foo.bar" : "val_WILL_NOT_SHOW",
  "foo.bat" : "val_THIS_EITHER"
}
    } ]
  }
}

[clintongormley]

Hi @dcw-netflix

Yes, we're planning on making dots in field names illegal for this reason: See #6736