Filter All using Elasticsearch - reactjs

Question

Let's say I have User table with fields like name, address, age, etc. There are more than 1000 records in this table, so I used Elasticsearch to retrieve this data one page at a time, 20 records.
And let's say I just wanted to search for some text "Alexia", so I wanted to display: is there any record contain Alexia? But special thing is that I wanted to search this text via all my fields within the table.
Does search text match the name field or age or address or any? IF it does, it should return values. We are not going to pass any specific field for Elastic query. If it returns more than 20 records matched with my text, the pagination should work.
Any idea of how to do such a query? or any way to connect Elasticsearch?

Answer 1

Yes you can do that by query String
{
"size": 20,
"query": {
"query_string": {
"query": "Alexia"
},
"range": {
"dateField": {
"gte": **currentTime** -------> This could be current time or age or any property that like to do a range query
}
}
},
"sort": [
{
"dateField": {
"order": "desc"
}
}
]
}
For getting only 20 records you can pass the Size as 20 and for Pagination you can use RangeQuery and get the next set of Messages
{
"size": 20,
"query": {
"query_string": {
"query": "Alexia"
},
"range": {
"dateField": {
"gt": 1589570610732. ------------> From previous response
}
}
},
"sort": [
{
"dateField": {
"order": "desc"
}
}
]
}

Answer 2

You can do the same by using match query as well . If in match query you specify _all it will search in all the fields.
{
"size": 20,
"query": {
"match": {
"_all": "Alexia"
},
"range": {
"dateField": {
"gte": **currentTime**
}
}
},
"sort": [
{
"dateField": {
"order": "desc"
}
}
]
}
When you are using ElasticSearch to provide search functionality in search boxes , you should avoid using query_string because it throws error in case of invalid syntax, which other queries return empty result. You can read about this from query_string.
_all is deprecated from ES6.0, so if you are using ES version from 6.x ownwards you can use copy_to to copy all the values of field into single field and then search on that single field. You can refer more from copy_to.
For pagination you can make use of from and size parameter . size parameter tells you how many documents you want to retrieve and from tells from which hit you want to process.
Query :
{
"from" : <current-count>
"size": 20,
"query": {
"match": {
"_all": "Alexia"
},
"range": {
"dateField": {
"gte": **currentTime**
}
}
},
"sort": [
{
"dateField": {
"order": "desc"
}
}
]
}
from field value you can set incremently in each iteration to how much much documents you got. For e.g. first iteration you can set from as 0 . For next iteration you can set it as 21 (since in first iteration you got first 20 hits and in second iteration you want to get documents after first 20 hits). You can refer this.