ElasticSearch query stops working with big amount of data - search

Question

The problem: I have 2 identical in terms of settings and mappings indexes.
The first index contains only 1 document.
The second index contains the same document + 16M of others.
When I'm running the query on the first index it returns the document, but when I do the same query on the second — I receive nothing.
Indexes settings:
{
"tasks_test": {
"settings": {
"index": {
"analysis": {
"analyzer": {
"tag_analyzer": {
"filter": [
"lowercase",
"tag_filter"
],
"tokenizer": "whitespace",
"type": "custom"
}
},
"filter": {
"tag_filter": {
"type": "word_delimiter",
"type_table": "# => ALPHA"
}
}
},
"creation_date": "1444127141035",
"number_of_replicas": "2",
"number_of_shards": "5",
"uuid": "wTe6WVtLRTq0XwmaLb7BLg",
"version": {
"created": "1050199"
}
}
}
}
}
Mappings:
{
"tasks_test": {
"mappings": {
"Task": {
"dynamic": "false",
"properties": {
"format": "dateOptionalTime",
"include_in_all": false,
"type": "date"
},
"is_private": {
"type": "boolean"
},
"last_timestamp": {
"type": "integer"
},
"name": {
"analyzer": "tag_analyzer",
"type": "string"
},
"project_id": {
"include_in_all": false,
"type": "integer"
},
"user_id": {
"include_in_all": false,
"type": "integer"
}
}
}
}
}
The document:
{
"_index": "tasks_test",
"_type": "Task",
"_id": "1",
"_source": {
"is_private": false,
"name": "135548- test with number",
"project_id": 2,
"user_id": 1
}
}
The query:
{
"query": {
"filtered": {
"query": {
"bool": {
"must": [
[
{
"match": {
"_all": {
"query": "135548",
"type": "phrase_prefix"
}
}
}
]
]
}
},
"filter": {
"bool": {
"must": [
{
"term": {
"is_private": false
}
},
{
"terms": {
"project_id": [
2
]
}
},
{
"terms": {
"user_id": [
1
]
}
}
]
}
}
}
}
}
Also, some findings:
if I replace _all with name everything works
if I replace match_phrase_prefix with match_phrase works too
ES version: 1.5.1
So, the question is: how to make the query work for the second index without mentioned hacks?