advanced search with ElasticSerach - php

Question

I've create a small application with PHP and I use ES.
My request is good, but I've got the good result.
My request look-like that:
link:9200/index/_search?from=0&size=130&q=try:'yes'
%2Bbrand:'BMW' %2Bmodel:'SERIE 5' %2Bprice:[500 TO 700000]
When I send this query, ES reply me with model 'SERIE 3' and 'SERIE 5', it's great, but when I send this query, I would like to recover only 'BMW' and 'SERIE 5'.
How can I fix this?

Answer 1

First, you should take a look at the documentation to be more familiar with these notions (analyze / difference between query and filters) which are very important for a good use of ElasticSearch. You can find a good getting started documentation here.
Your problem is that your "model" field is a string, which by default is analyzed using the standard analyzer.
It outputs 2 tokens because of the whitespace in the model name as you can see if you use the _analyze endpoint :
GET _analyze?analyzer=standard&text='Serie 5'
{
"tokens": [
{
"token": "serie",
"start_offset": 1,
"end_offset": 6,
"type": "<ALPHANUM>",
"position": 1
},
{
"token": "5",
"start_offset": 7,
"end_offset": 8,
"type": "<NUM>",
"position": 2
}
]
}
On top of that, you're using a query and though will return all results matching even partially. So, you're certainly having the two cars in your results, but the "SERIE 5" car must be the first (as it matches better) than the car "SERIE 3", which is represented by a higher _score attribute.
You need to use a term filter which will return only the documents containing the term value you provided.
However, as it works on terms, you have to change the mapping of your field to "not_analyzed" like this to keep it as it is :
PUT /test/car/_mapping
{
"properties":{
"model":{
"type": "string",
"index":"not_analyzed"
}
}
}
Finally, the search request will be something like this (with price criteria as range filter and the use of a and filter to combine both) :
GET /test/car/_search
{
"query": {
"filtered": {
"filter": {
"and": {
"filters": [
{
"term": {
"model": "Serie 3"
}
},
{
"range": {
"price": {
"from": 500,
"to": 70000
}
}
}
]
}
}
}
}
}

Answer 2

Your query (url_decoded) looks like
link:9200/index/_search?from=0&size=130&q=try:'yes' +brand:'BMW' +model:'SERIE 5' +price:[500 TO 700000]
I think you are using '+' incorrectely, so that it is doing or operation for your query,
If you want to get with try:yes, brand:BMW and model:SERIE 5 then you have to join these query by AND keyword.
like.
link:9200/index/_search?from=0&size=130&q=try:'yes'
AND brand:'BMW' AND model:'SERIE 5' AND price:[500 TO 700000]
And you should be aware of choosing analyzer (in mapping of fields), so that things are indexed as you want.
It will work, Thanks
Reference