Elasticsearch是一个基于Apache Lucene(TM)的开源搜索引擎。无论在开源还是专有领域，Lucene可以被认为是迄今为止最先进、性能最好的、功能最全的搜索引擎库。
Elasticsearch使用标准的RESTful API和JSON。我们还用多种语言构建和维护客户机，如Java、Python、。NET、SQL和PHP。此外，我们的社区贡献了更多。它们易于使用，使用起来很自然，而且，就像Elasticsearch一样，不会限制您对它们的使用。
下面看下基于Net的使用
https://github.com/elastic/elasticsearch-net
选择 Elasticsearch.Net 作为客户端
连接
var node = new Uri("http://myserver:9200");
var config = new ConnectionConfiguration(node);
var client = new ElasticLowLevelClient(config);
var myJson = @"{ ""hello"" : ""world"" }";
client.Index<StringResponse>("myindex", "1", myJson);
var myJson = new { hello = "world" };
client.Index<BytesResponse>("myindex", "1", PostData.Serializable(myJson));创建
public class ElasticSearchClient{public ElasticLowLevelClient Client { get; }private readonly IConfiguration _configuration;public ElasticSearchClient(IConfiguration configuration){_configuration = configuration;Client = InitClient();}#region Methodspublic async Task<string> Index(string index, string id, PostData body){var response = await Client.IndexAsync<StringResponse>(index, id, body);ResponseValidate(response);return response.Body;}查询
public async Task<List<string>> SearchWithHighLight(string index, string query){var response = await Client.SearchAsync<StringResponse>(index,PostData.Serializable(new{from = 0,size = 100,query = new{match = new{content = query}},highlight = new{pre_tags = new[] { "<tag1>", "<tag2>" },post_tags = new[] { "/<tag1>", "/<tag2>" },fields = new{content = new { }}}}));ResponseValidate(response);var responseJson = (JObject)JsonConvert.DeserializeObject(response.Body);var hits = responseJson["hits"]["hits"] as JArray;var result = new List<string>();foreach (var hit in hits){var id = hit["_id"].ToObject<string>();result.Add(id);}return result;}删除
public async Task<bool> Delete(string index, string id){var response = await Client.DeleteAsync<StringResponse>(index, id);ResponseValidate(response);return response.Success;}#endregion#region privatesprivate ElasticLowLevelClient InitClient(){var node = new Uri(_configuration.GetConnectionString("ElasticSearch"));var settings = new ConnectionConfiguration(node);var client = new ElasticLowLevelClient(settings);return client;}private void ResponseValidate(StringResponse response){if (response.Success == false){throw new ResultException(response.Body);}}#endregion}使用
private readonly ElasticSearchClient _elasticSearchClient;
await _elasticSearchClient.Index(Article.EsIndex, article.ArticleUID,PostData.Serializable(article));
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