.NET client using (NEST API) for simple full text search with sample queries. Java client (Java High Level REST Client) is in "java" branch.
- Download Elasticsearch and follow instructions from https://www.elastic.co/downloads/elasticsearch in order to run bin\elasticsearch.bat on Windows.
- Run the application on Visual Studio.
- Queries are in ElasticSearchASPApplication.Services namespace. Current implementation only calls SimpleSearch function.
- Search results are not shown in ASP.NET view. Run/Debug test cases instead.
Searching all products
GET /company/product/_search/
Using query DSL for more usefull search
In order to make a more useful search request, we also need to supply a request body with a query.
POST /company/product/_search/
{
"query": {
"query_string": {
"query": "Huawei",
}
}
}
Fine tuning query string queries
Retrieve documents with the name of “Huawei”
POST /company/product/_search/
{
"query": {
"query_string": {
"query": "Huawei",
"fields": [
"name"
]
}
}
}
Searching for multiple products
POST /company/product/_search/
{
"query": {
"query_string": {
"query": "Huawei iPhone6s",
}
}
}
Filtering
Filter for specific value:
POST /company/product/_search/
{
"query": {
"bool": {
"must": {
"match": {
"name": "Samsung"
}
},
"filter": {
"term": {
"price": 2900
}
}
}
}
}
Filter with a range:
POST /company/product/_search/
{
"query": {
"bool": {
"must": {
"match": {
"name": "Samsung"
}
},
"filter": [
{
"range": {
"price": {
"gte": 1000,
"lte": 4000
}
}
}
]
}
}
}
Sorting
Sort all products
POST /company/product/_search/
{
"query": {
"match_all": {}
},
"sort": {
"price": "asc"
}
}
Sort product with a name "Samsung"
POST /company/product/_search/
{
"query": {
"query_string": {
"query": "Samsung"
}
},
"sort": {
"price": "asc"
}
}
Pagination
ElasticSearch returns the first ten hits by default. You can change it via size parameter.
POST /company/product/_search/
{
"query": {
"match_all": {}
},
"sort": {
"price": "asc"
},
"size": 12
}
Retrieving only parts of documents
Add _source property to the query. Following query retrieves only “name” of all products. It is also possible to retrieve multiple fields as well using "_source": ["property1", "property2"]
Query:
POST /company/product/_search/
{
"_source": "name"
}
Result:
{
"_index": "company",
"_type": "product",
"_id": "AV57gFjUQ8Qv2Iw4gRgt",
"_score": 1,
"_source": {
"name": "iPhone7"
}
}
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