The basic usage of Nest client, nest Client

The basic usage of Nest client, nest Client

Install the related Dll of Nest through Nuget, and then we can start,

1. initialize the Nest Client

string indexName = "customer";Uri uri = new Uri("http://localhost:9200");ConnectionSettings settings = new ConnectionSettings(uri);settings.DisableDirectStreaming().DefaultIndex(indexName);ElasticClient client = new ElasticClient(settings);

 

2. Create a Customer Index

    dynamic response = client.GetIndex(indexName);     if(!response.IsValid)      {         response = client.CreateIndex("customer");         Console.WriteLine(response);       }

3. Create a document

Var company = new Company {CompanyID = 2, Name = "IBM"}; // create a document and specify the index, and the Document ID response = client. index (company, I => I. index (indexName ). id (company. companyID); // create a document and specify the index, document type, and Document ID. ElasticSearch will generate a random ID response = client. index (company, I => I. index (indexName); // The specified Index is not displayed here, so the client used to initialize the default Index. If there is no default Index, the error response = client will occur. index (company );

4. modify document 1

Modify the document according to CompanyID. If a file with a CompanyID of 2 exists in the store, it will replace the old one with a new one. Otherwise, it will be created.

Therefore, it is more appropriate to create a style modification.

Company = new Company {CompanyID = 2, Name = "Lenovo"}; // modify the document response = client. index (company, I => I. id (company. companyID ));

5. Modify the document of the specified version number (implementation of optimistic locks)

Company = new Company {CompanyID = 2, Name = "Lenovo"}; // modify the document response = client of the specified version. index (company, I => I. id (company. companyID ). version (1 ));

6. delete a document

// Delete the document response = client according to specific conditions. delete <Company> (company. companyID, d => d. index (indexName); // Delete the document response = client. delete <Company> (company. companyID );

 

7. delete an index

// Delete the index response = client. DeleteIndex (indexName) according to the name );

8. Create documents in batches

The corresponding index is specified here. If the specified index is not displayed, the default index is used,

// Batch create the document BulkDescriptor descriptor = new BulkDescriptor (); descriptor. index <Company> (op => op. document (new Company {CompanyID = 1, Name = "IBM "}). index ("a"); descriptor. index <Company> (op => op. document (new Company {CompanyID = 2, Name = "IBM "}). index ("B"); descriptor. index <Company> (op => op. document (new Company {CompanyID = 3, Name = "IBM "}). index ("c"); response = client. bulk (descriptor );