Filtered Query with Term on collection - elasticsearch

Question

I'm taking an old project to maintain and I am stuck since a day on a query.
The elasticsearch version I use is 1.7 but I don't think this is relevant to my problem.
I have some teacher documents :
{
"id": 244,
"degree": [],
"teacherDiplomaRelation": [],
"user": {
"enabled": true
},
"teacherClassDisciplineRelation": [
SEE BELOW
}
The teacherClassDisciplineRelation is N times this format (for every couple levelTree/Discipline that I have)
{
"levelTree": {
"id": 34,
"label": "1st year of college",
"slugLastLevelDisplay": "college"
},
"discipline": {
"id": 1,
"label": "Maths",
"slug": "maths"
},
"cityLocation": "10.1010,10.1010"
}
Now i want to get all teacher enabled and having maths in their disciplines. my query is:
{
"query": {
"filtered": {
"filter": {
"bool": {
"must": [
{
"term": {
"user.enabled": true
}
},
{
"term": {
"teacherClassDisciplineRelation.discipline.slug": "maths"
}
}
]
}
}
}
},
"size": {
"from": 0,
"size": 15
}
}
Mapping:
"teacherClassDisciplineRelation": {
"type": "nested",
"properties": {
"cityLocation": {
"type": "geo_point",
"store": true
},
"discipline": {
"properties": {
"id": {
"type": "string",
"store": true
},
"label": {
"type": "string",
"boost": 7.0,
"store": true,
"analyzer": "custom_analyzer"
},
"slug": {
"type": "string",
"boost": 7.0,
"index": "not_analyzed",
"store": true,
"norms": {
"enabled": true
}
}
}
}
Problem:
My query with "user.enabled": true give me some results,
My query with "teacherClassDisciplineRelation.discipline.slug": "maths" always gives me 0 result but I've checked in the index, I should have some results.
I'm new to elasticsearch but I can't find out why my result is always 0.
Any idea why?

Answer 1

Since teacherClassDisciplineRelation is a nested field. You have to use Nested Query.
{
"query": {
"bool": {
"must": [
{
"nested": {
"path": "teacherClassDisciplineRelation",
"query": {
"term": {
"teacherClassDisciplineRelation.discipline.slug": {
"value": "maths"
}
}
}
}
},
{
"term": {
"user.enabled": true
}
}
]
}
}
}
Hope this helps!!