I'm trying to query an elastic search index using a match_all query.
Uri uri = new Uri("http://10.10.10.67:9200");
ConnectionSettings connection = new ConnectionSettings(uri);
connection.SetDefaultIndex("leases");
int port = connection.Port;
ElasticClient client = new ElasticClient(connection);
var feeQueryObject = client.Search<FeeQueryResult>(s => s
.Type("leases").MatchAll());
Using sense, I get results but not with NEST.
Not sure if I have to set up my mapped class exactly how the schema is in the ElasticSearch document? - I only have a few properties in my class, not all of them.
Any ideas as to why there are no results returned?
This was my fault.
The type was incorrect. Should be 'fee' not 'leases'.
Related
I am creating a simple elastic request with Nest.
var searchRequest = new SearchRequest()
{
Aggregations = new AggregationDictionary()
{
}
};
When I serialize the query with elasticClient.RequestResponseSerializer.SerializeToString(searchRequest the query I am seeing like this :
{"aggs":{},"aggregations":{}}
Aggregation sections were created two times.
What should I do?
Is this a problem?
My nest version and elastic Search version are 7.6.2
Thanks.
I am running various Elastic Search queries from my Java code. In order to consolidate my code, I would like to initialize a SearchResponse object before my conditional loops that each run an ElasticSearch query with different settings. This way, I can execute a single line of code once for getting the total hits from the query. You'll get what I mean from the code
#GET
#Path("/search")
public SearchResultsAndFacets search() {
SearchResultsAndFacets srf = new SearchResultsAndFacets();
RestHighLevelClient client = createHighLevelRestClient();
// Build the base query that applies to all searches
SearchSourceBuilder querySourceBuilder = buildQueryWrapper(colNames, sro.q, sro.f,
facetsToUpdate, sro.u, sro.lc);
SearchResponse searchresponse; // This line does not work. How can I initialize this object here (outside of the following conditional loops)?
// Searches executed from the table view to populate a table of documents
if (searchType.equals("table")) {
List<SortParameters> sortParametersList = sortAdapter(sro.s);
searchResponse = runTableQuery(client, querySourceBuilder, sortParameters, offset, limit);
}
// Searches involving geo_point data to populate a leaflet map
if (searchType.equals("contacts")) {
RestHighLevelClient client = createHighLevelRestClient();
ElasticSearchMapService esms = new ElasticSearchMapService();
searchResponse = esms.runContactsMapQuery(querySourceBuilder, client, <some geographic coordinate parameters necessary for this search>);
MapSearchResponse mapSearchResponse = esms.getLocationsFromSearchResponse(searchResponse);
srf.mapSearchResponse = mapSearchResponse;
}
// I would like to include these next few lines here at the end of the conditional loops.
// Currently they must be inside each if clause.
srf.totalHits = searchResponse.getHits().getTotalHits().value;
srf.elapsed = searchResponse.getTook().getMillis();
srf.facetsData = getUpdatedFacetData(facetsToUpdate,
searchResponse, sro.f);
return srf;
}
Elastic's high level REST client for JAVA does not allow initializing a SearchResponse object like this. It is also not possible to do so with
SearchResponse searchResponse = new SearchResponse();
And there is a null pointer error if we do...
SearchResponse searchResponse = new SearchResponse(null);
How can I rewrite this code so that I can fetech totalHits, elapsed and facetsData outside of the conditional loops?
I have two different documents in the Elasticsearch - Decision and Nomination.
Right now I can only search all of the documents wit Decision type.
I use Spring Data Elasticsearch for this purpose:
PageRequest pageRequest = DecisionUtils.createPageRequest(pageNumber, pageSize);
MultiMatchQueryBuilder fuzzyMmQueryBuilder = multiMatchQuery(query, "name", "description").fuzziness("AUTO");
BoolQueryBuilder boolQueryBuilder = new BoolQueryBuilder().should(fuzzyMmQueryBuilder);
NativeSearchQueryBuilder nativeSearchQueryBuilder = new NativeSearchQueryBuilder();
nativeSearchQueryBuilder.withIndices(ESDecision.INDEX_NAME).withTypes(ESDecision.TYPE).withPageable(pageRequest);
NativeSearchQuery nativeSearchQuery = nativeSearchQueryBuilder.withQuery(boolQueryBuilder).withPageable(pageRequest).build();
return elasticsearchTemplate.queryForPage(nativeSearchQuery, ESDecision.class);
Is it possible to update this code to search by Decision and Nomination simultaneously in order to get the search result from both of them ? If the answer is yes - please show an example how to implement this and also please show how to determine at search results who is Decision and who is Nomination ? Is there any classification field that can be added into search result entity for this purpose ?
With nest I am doing a Terms aggregation .
I am also doing an inner TopHits aggregation .
My result give me all results infos in the response object except TopHits values which i can read thanks to TopHits() method.
I would like to have tophits values directly in result without using NEST TopHits() methode for reading into aggs. I would like to have all datas in info as we have in elastic search classic requests.
This is what i am actually doing :
My aggregation request:
var response = Client.Search<myclass>(s => s
.Type("type")
.Aggregations(a => a
.Terms("code_bucket", t => t
.Field("field_of_aggregation")
.Size(30)
.Order(TermsOrder.CountAscending)
.Aggregations(a2 => a2
.TopHits("code_bucket_top_hits", th => th.Size(20))
)
)));
I receive a result object in wich i can access all infos except TopHits.
if we examine results we can see TopHits values are stored in private field "_hits":
If I stringify result object , i can see the total number of TopHits, but I can't see the field _hits so i can see the documents:
JavaScriptSerializer js = new JavaScriptSerializer();
string json = js.Serialize(response);
json does not contains topHits result:
I can access to values but i need to use nest method TopHits():
var firstBucket= response.Aggs.Terms("code_bucket");
foreach (var bucket in firstBucket.Buckets)
{
var hits = bucket.TopHits("code_bucket_top_hits");
foreach (var hit in hits.Documents<myclass>())
{
var prop1= hit.prop1;
var prop2= hit.prop2;
}
}
}
But it would be really usefule if i could have all infos in one , like we have when we do elasticsearch request without nest
Do you know if there is a way?
NEST is a higher level abstraction over Elasticsearch that models each request and response with strong types, providing fluent and object initializer syntaxes to build requests, and methods to access portions of the response, without having to handle JSON serialization yourself.
Sometimes however, you might want to manage this yourself, which is what it sounds like you'd like to do. In these cases, Elasticsearch.Net can be used, which is a low level client for Elasticsearch and is unopinionated in how you model your requests and responses.
You can use the client in Elasticsearch.Net instead of NEST, however, the good news is NEST uses Elasticsearch.Net under the covers and also exposes the low level client through the .LowLevel property on IElasticClient. Why would you want to use the lowlevel client on NEST as opposed to just using Elasticsearch.Net directly? A major reason to do so is that you can take advantage of strong types for requests and responses when you need to and leverage NEST's usage of Json.NET for serialization, but bypass this and make calls with the low level client when you want/need to.
Here's an example
var client = new ElasticClient();
var searchRequest = new SearchRequest<Question>
{
Size = 0,
Aggregations = new TermsAggregation("top_tags")
{
Field = "tags",
Size = 30,
Order = new[] { TermsOrder.CountAscending },
Aggregations = new TopHitsAggregation("top_tag_hits")
{
Size = 20
}
}
};
var searchResponse = client.LowLevel.Search<JObject>("posts", "question", searchRequest);
// this will be of type JObject. Do something with it
searchResponse.Body
Here, I can use NEST's object initializer syntax to construct a request, but use the low level client to deserialize the response to a Json.NET JObject. You can deserialize to a T of your choosing by changing it in client.LowLevel.Search<T>(). You could for example use
var searchResponse = client.LowLevel.Search<string>("posts", "question", searchRequest);
to return a string, or
var searchResponse = client.LowLevel.Search<Stream>("posts", "question", searchRequest);
to return a stream, etc.
I'm using elastic search with jest (as java client).
I need some fields that is in nested document and since cannot get nested fields as pair, I need '_source' to get them.
Here is previous question to get them in ES query[ Link ], and It works well.
BUT cannot convert its query as jest code.
Below is my try.
SearchSourceBuilder searchSourceBuilder = new SearchSourceBuilder().query(
query
)
.fields( // need _source but no method.
"oid",
"_source.events.activityoid",
"_source.events.worktime");
Try using fetchSource() like this:
SearchSourceBuilder searchSourceBuilder = new SearchSourceBuilder()
.query(query)
.fetchSource(new String[] {
"oid",
"events.activityoid",
"events.worktime"
}, null);