Difference between a "plain" terms query and a terms query using a filter - elasticsearch

Question

I am trying to understand what the difference is between:
a "plain" elasticsearch query that is going to match a terms query and return a certain number of hits.
and a filtered query (therefore using a filter) that is going to return the same number of hits.
Here is the terms query:
GET _search
{
"query": {
"terms": {
"childcareTypes": [
"SOLE_CHARGE",
"OUT_OF_SCHOOL",
"BABY_SITTING"
],
"minimum_match": 3
}
}
}
Here is the filtered version:
GET _search
{
"query": {
"filtered": {
"filter": {
"terms": {
"childcareTypes": [
"SOLE_CHARGE",
"OUT_OF_SCHOOL",
"BABY_SITTING"
],
"execution": "and"
}
}
}
}
}
Both return a total hits of 8000 (against my index).
Here is the result from the "plain" terms query:
{
"took": 7,
"timed_out": false,
"_shards": {
"total": 5,
"successful": 5,
"failed": 0
},
"hits": {
"total": 8000,
"max_score": 5.134171,
"hits": [
{
"_index": "bignibou",
"_type": "advertisement",
"_id": "AUs2T2lt3L5LNr7nkot2",
"_score": 5.134171,
"_source": {
"childcareWorkerType": "AUXILIAIRE_PARENTALE",
"childcareTypes": [
"SOLE_CHARGE",
"OUT_OF_SCHOOL",
"BABY_SITTING"
],
"address": {
"latitude": 48.8532558,
"longitude": 2.36584
},
"giveBath": "EMPTY"
}
},
...
Here is the result from the "filtered" query:
{
"took": 3,
"timed_out": false,
"_shards": {
"total": 5,
"successful": 5,
"failed": 0
},
"hits": {
"total": 8000,
"max_score": 1,
"hits": [
{
"_index": "bignibou",
"_type": "advertisement",
"_id": "AUs2T2lt3L5LNr7nkot2",
"_score": 1,
"_source": {
"childcareWorkerType": "AUXILIAIRE_PARENTALE",
"childcareTypes": [
"SOLE_CHARGE",
"OUT_OF_SCHOOL",
"BABY_SITTING"
],
"address": {
"latitude": 48.8532558,
"longitude": 2.36584
},
"giveBath": "EMPTY"
}
},
....
Then what are the differences between the two?

Answer 1

This is related to the differences between queries and filters (more information here).
In your case, unlike terms query, terms filter :
is cached
doesn't compute the score : all matching documents have the same _score of 1 (look at your results)
Consequently, the biggest difference is that the filtered query will be faster than a 'plain' terms query.