Index aliases vs search

gistfile1.txt

curl -XDELETE 'http://localhost:9200/test'
curl -XPOST 'http://localhost:9200/test' -d '{"settings":{"index":{"number_of_shards":30,"number_of_replicas":1}}}'
curl -XPOST 'http://localhost:9200/_aliases' -d '{"actions":[{"add":{"index":"test","alias":"1","filter":{"term":{"user":1}},"routing":"1"}}]}'
curl -XPOST 'http://localhost:9200/1/documents/doc1' -d '{"user":1,"data":"sample data"}'
curl -XPOST 'http://localhost:9200/1/documents/doc2' -d '{"user":1,"data":"sample data 2"}'

// Does not work:
curl -XPOST 'http://localhost:9200/1/_search?pretty=1'
{
  "took" : 5,
  "timed_out" : false,
  "_shards" : {
    "total" : 1,
    "successful" : 1,
    "failed" : 0
  },
  "hits" : {
    "total" : 0,
    "max_score" : null,
    "hits" : [ ]
  }
}

// Works:
curl -XPOST 'http://localhost:9200/test/_search?pretty=1'
{
  "took" : 11,
  "timed_out" : false,
  "_shards" : {
    "total" : 30,
    "successful" : 30,
    "failed" : 0
  },
  "hits" : {
    "total" : 2,
    "max_score" : 1.0,
    "hits" : [ {
      "_index" : "test",
      "_type" : "documents",
      "_id" : "doc1",
      "_score" : 1.0, "_source" : {"user":1,"data":"sample data"}
    }, {
      "_index" : "test",
      "_type" : "documents",
      "_id" : "doc2",
      "_score" : 1.0, "_source" : {"user":1,"data":"sample data 2"}
    } ]
  }
}

// But, this works:

curl -XPOST 'http://localhost:9200/_aliases' -d '{"actions":[{"remove":{"index":"test","alias":"1"}}]}'
curl -XPOST 'http://localhost:9200/_aliases' -d '{"actions":[{"add":{"index":"test","alias":"1","filter":{"term":{"user":1}},"routing":"1"}}]}'
curl -XPOST 'http://localhost:9200/1/_search?pretty=1'
{
  "took" : 153,
  "timed_out" : false,
  "_shards" : {
    "total" : 1,
    "successful" : 1,
    "failed" : 0
  },
  "hits" : {
    "total" : 2,
    "max_score" : 1.0,
    "hits" : [ {
      "_index" : "test",
      "_type" : "documents",
      "_id" : "doc1",
      "_score" : 1.0, "_source" : {"user":1,"data":"sample data"}
    }, {
      "_index" : "test",
      "_type" : "documents",
      "_id" : "doc2",
      "_score" : 1.0, "_source" : {"user":1,"data":"sample data 2"}
    } ]
  }
}