Continue from section 14
7), filter [Result filtering]
Not all queries need to generate scores, especially those documents that are only used for "fitering" (filtering). In order not to calculate the score, Elasticsearch will automatically check the scene and optimize the execution of the query.
The query specified under the filter element has no effect on the score-the score is returned as 0. The score is only affected by the specified query.
To mustquery as an example:
GET /bank/_search
{
"query": {
"bool": {
"must": [
{
"range": {
"age": {
"gte": 18,
"lte": 30
}
}}
]
}
}
}
Use filterinstead of mustqueries should be noted that the use of filtercheck out the results and mustcheck out the result is the same, only difference is that there is no correlation score:
GET /bank/_search
{
"query": {
"bool": {
"filter": {
"range": {
"age": {
"gte": 18,
"lte": 30
}
}
}
}
}
}
So we shouldcan add after filteradding a filter:
GET /bank/_search
{
"query": {
"bool": {
"must": [
{
"match": {
"gender": "M"
}
},
{
"match": {
"address": "Mill"
}
}
],
"must_not": [
{
"match": {
"age": 30
}}
],
"should": [
{
"match": {
"lastname": "Holland"
}}
],
"filter": {
"range": {
"age": {
"gte": 18,
"lte": 30
}
}
}
}
}
}
reference:
Getting started with the full-text search engine Elasticsearch