[8.19] Add LINQ to ESQL provider methods (#8858)

src/Elastic.Clients.Elasticsearch/Elastic.Clients.Elasticsearch.csproj

@@ -1,4 +1,4 @@
-<Project Sdk="Microsoft.NET.Sdk">
+<Project Sdk="Microsoft.NET.Sdk">
 
   <PropertyGroup>
     <PackageId>Elastic.Clients.Elasticsearch</PackageId>
@@ -31,6 +31,7 @@
   </PropertyGroup>
 
   <ItemGroup>
+    <PackageReference Include="Elastic.Esql" Version="0.10.0" />
     <PackageReference Include="Elastic.Transport" Version="0.15.1" />
     <PackageReference Include="PolySharp" Version="1.15.0">
       <PrivateAssets>all</PrivateAssets>

src/Elastic.Clients.Elasticsearch/_Shared/Api/Esql/EsqlQueryExecutor.cs

@@ -0,0 +1,281 @@
+// Licensed to Elasticsearch B.V under one or more agreements.
+// Elasticsearch B.V licenses this file to you under the Apache 2.0 License.
+// See the LICENSE file in the project root for more information.
+
+using System;
+using System.Collections.Generic;
+using System.IO;
+using System.Text.Json;
+using System.Threading;
+using System.Threading.Tasks;
+using Elastic.Esql;
+using Elastic.Esql.Execution;
+using Elastic.Esql.QueryModel;
+using Elastic.Transport;
+
+#if NET10_0_OR_GREATER
+using System.IO.Pipelines;
+#endif
+
+namespace Elastic.Clients.Elasticsearch.Esql;
+
+/// <summary>
+/// Implements <see cref="IEsqlQueryExecutor"/> by delegating to the native
+/// <see cref="EsqlNamespacedClient"/> typed request/response pipeline.
+/// </summary>
+internal sealed class EsqlQueryExecutor : IEsqlQueryExecutor
+{
+	private readonly EsqlNamespacedClient _client;
+
+	public EsqlQueryExecutor(EsqlNamespacedClient client)
+	{
+		_client = client ?? throw new ArgumentNullException(nameof(client));
+	}
+
+	public IEsqlResponse ExecuteQuery(string esql, EsqlParameters? parameters, object? options)
+	{
+		var queryOptions = ResolveOptions(options);
+		var request = BuildQueryRequest(esql, parameters, queryOptions);
+		request.BeforeRequest();
+		var response = _client.DoRequest<EsqlQueryRequest, StreamResponse, EsqlQueryRequestParameters>(request);
+		return new EsqlTransportResponse(response);
+	}
+
+	public async Task<IEsqlAsyncResponse> ExecuteQueryAsync(string esql, EsqlParameters? parameters, object? options, CancellationToken cancellationToken)
+	{
+		var queryOptions = ResolveOptions(options);
+		var request = BuildQueryRequest(esql, parameters, queryOptions);
+		request.BeforeRequest();
+		var response = await _client.DoRequestAsync<EsqlQueryRequest, StreamResponse, EsqlQueryRequestParameters>(request, cancellationToken)
+			.ConfigureAwait(false);
+		return new EsqlTransportAsyncResponse(response);
+	}
+
+	public IEsqlResponse SubmitAsyncQuery(string esql, EsqlParameters? parameters, object? options, EsqlAsyncQueryOptions? asyncOptions)
+	{
+		var queryOptions = ResolveOptions(options);
+		var request = BuildAsyncQueryRequest(esql, parameters, queryOptions, asyncOptions);
+		request.BeforeRequest();
+		var response = _client.DoRequest<AsyncQueryRequest, StreamResponse, AsyncQueryRequestParameters>(request);
+		return new EsqlTransportResponse(response);
+	}
+
+	public async Task<IEsqlAsyncResponse> SubmitAsyncQueryAsync(string esql, EsqlParameters? parameters, object? options, EsqlAsyncQueryOptions? asyncOptions, CancellationToken cancellationToken)
+	{
+		var queryOptions = ResolveOptions(options);
+		var request = BuildAsyncQueryRequest(esql, parameters, queryOptions, asyncOptions);
+		request.BeforeRequest();
+		var response = await _client.DoRequestAsync<AsyncQueryRequest, StreamResponse, AsyncQueryRequestParameters>(request, cancellationToken)
+			.ConfigureAwait(false);
+		return new EsqlTransportAsyncResponse(response);
+	}
+
+	public IEsqlResponse PollAsyncQuery(string queryId, object? options)
+	{
+		var queryOptions = ResolveOptions(options);
+		var request = new AsyncQueryGetRequest(queryId) { Format = EsqlFormat.Json };
+		if (queryOptions?.RequestConfiguration is not null)
+			request.RequestConfiguration = queryOptions.RequestConfiguration;
+		request.BeforeRequest();
+		var response = _client.DoRequest<AsyncQueryGetRequest, StreamResponse, AsyncQueryGetRequestParameters>(request);
+		return new EsqlTransportResponse(response);
+	}
+
+	public async Task<IEsqlAsyncResponse> PollAsyncQueryAsync(string queryId, object? options, CancellationToken cancellationToken)
+	{
+		var queryOptions = ResolveOptions(options);
+		var request = new AsyncQueryGetRequest(queryId) { Format = EsqlFormat.Json };
+		if (queryOptions?.RequestConfiguration is not null)
+			request.RequestConfiguration = queryOptions.RequestConfiguration;
+		request.BeforeRequest();
+		var response = await _client.DoRequestAsync<AsyncQueryGetRequest, StreamResponse, AsyncQueryGetRequestParameters>(request, cancellationToken)
+			.ConfigureAwait(false);
+		return new EsqlTransportAsyncResponse(response);
+	}
+
+	public void DeleteAsyncQuery(string queryId, object? options)
+	{
+		var queryOptions = ResolveOptions(options);
+		var request = new AsyncQueryDeleteRequest(queryId);
+		if (queryOptions?.RequestConfiguration is not null)
+			request.RequestConfiguration = queryOptions.RequestConfiguration;
+		request.BeforeRequest();
+		_client.DoRequest<AsyncQueryDeleteRequest, AsyncQueryDeleteResponse, AsyncQueryDeleteRequestParameters>(request);
+	}
+
+	public async Task DeleteAsyncQueryAsync(string queryId, object? options, CancellationToken cancellationToken)
+	{
+		var queryOptions = ResolveOptions(options);
+		var request = new AsyncQueryDeleteRequest(queryId);
+		if (queryOptions?.RequestConfiguration is not null)
+			request.RequestConfiguration = queryOptions.RequestConfiguration;
+		request.BeforeRequest();
+		await _client.DoRequestAsync<AsyncQueryDeleteRequest, AsyncQueryDeleteResponse, AsyncQueryDeleteRequestParameters>(request, cancellationToken)
+			.ConfigureAwait(false);
+	}
+
+	private static EsqlQueryOptions? ResolveOptions(object? options) =>
+		options as EsqlQueryOptions;
+
+	private static EsqlQueryRequest BuildQueryRequest(string esql, EsqlParameters? parameters, EsqlQueryOptions? options)
+	{
+		var request = new EsqlQueryRequest(esql)
+		{
+			Format = EsqlFormat.Json,
+			Columnar = false,
+			Params = MergeAndConvertParams(parameters, options?.NamedParameters)
+		};
+
+		ApplyQueryOptions(request, options);
+		return request;
+	}
+
+	private static AsyncQueryRequest BuildAsyncQueryRequest(string esql, EsqlParameters? parameters, EsqlQueryOptions? queryOptions, EsqlAsyncQueryOptions? asyncOptions)
+	{
+		var request = new AsyncQueryRequest(esql)
+		{
+			Format = EsqlFormat.Json,
+			Columnar = false,
+			Params = MergeAndConvertParams(parameters, queryOptions?.NamedParameters)
+		};
+
+		ApplyQueryOptions(request, queryOptions);
+
+		if (asyncOptions is not null)
+		{
+			if (asyncOptions.WaitForCompletionTimeout is { } waitTimeout)
+				request.WaitForCompletionTimeout = new Duration(waitTimeout);
+
+			if (asyncOptions.KeepAlive is { } keepAlive)
+				request.KeepAlive = new Duration(keepAlive);
+
+			request.KeepOnCompletion = asyncOptions.KeepOnCompletion;
+		}
+
+		return request;
+	}
+
+	private static void ApplyQueryOptions(EsqlQueryRequest request, EsqlQueryOptions? options)
+	{
+		if (options is null)
+			return;
+
+		request.Locale = options.Locale;
+		request.TimeZone = options.TimeZone;
+		request.Filter = options.Filter;
+		request.AllowPartialResults = options.AllowPartialResults;
+		request.DropNullColumns = options.DropNullColumns;
+		request.ProjectRouting = options.ProjectRouting;
+
+		if (options.RequestConfiguration is not null)
+			request.RequestConfiguration = options.RequestConfiguration;
+	}
+
+	private static void ApplyQueryOptions(AsyncQueryRequest request, EsqlQueryOptions? options)
+	{
+		if (options is null)
+			return;
+
+		request.Locale = options.Locale;
+		request.TimeZone = options.TimeZone;
+		request.Filter = options.Filter;
+		request.AllowPartialResults = options.AllowPartialResults;
+		request.DropNullColumns = options.DropNullColumns;
+		request.ProjectRouting = options.ProjectRouting;
+
+		if (options.RequestConfiguration is not null)
+			request.RequestConfiguration = options.RequestConfiguration;
+	}
+
+	private static Union<ICollection<ICollection<FieldValue>>, ICollection<KeyValuePair<string, ICollection<FieldValue>>>>?
+		MergeAndConvertParams(EsqlParameters? translated, Dictionary<string, FieldValue>? userParams)
+	{
+		var hasTranslated = translated is not null && translated.HasParameters;
+		var hasUser = userParams is { Count: > 0 };
+
+		if (!hasTranslated && !hasUser)
+			return null;
+
+		var merged = new Dictionary<string, FieldValue>();
+
+		if (hasTranslated)
+		{
+			foreach (var kvp in translated!.Parameters)
+				merged[kvp.Key] = ConvertJsonElement(kvp.Value);
+		}
+
+		if (hasUser)
+		{
+			foreach (var kvp in userParams!)
+				merged[kvp.Key] = kvp.Value;
+		}
+
+		var namedParams = new List<KeyValuePair<string, ICollection<FieldValue>>>(merged.Count);
+		foreach (var kvp in merged)
+		{
+			namedParams.Add(new KeyValuePair<string, ICollection<FieldValue>>(
+				kvp.Key, [kvp.Value]));
+		}
+
+		return new Union<ICollection<ICollection<FieldValue>>, ICollection<KeyValuePair<string, ICollection<FieldValue>>>>(namedParams);
+
+		static FieldValue ConvertJsonElement(JsonElement element) =>
+			element.ValueKind switch
+			{
+				JsonValueKind.String => FieldValue.String(element.GetString()!),
+				JsonValueKind.Number when element.TryGetInt64(out var l) => FieldValue.Long(l),
+				JsonValueKind.Number => FieldValue.Double(element.GetDouble()),
+				JsonValueKind.True => FieldValue.True,
+				JsonValueKind.False => FieldValue.False,
+				JsonValueKind.Null or JsonValueKind.Undefined => FieldValue.Null,
+				_ => FieldValue.String(element.GetRawText())
+			};
+	}
+}
+
+internal sealed class EsqlTransportResponse : IEsqlResponse
+{
+	private readonly StreamResponse _response;
+
+	public EsqlTransportResponse(StreamResponse response) => _response = response;
+
+	public Stream Body => _response.Body;
+
+	public void Dispose() => _response.Dispose();
+}
+
+#if NET10_0_OR_GREATER
+internal sealed class EsqlTransportAsyncResponse : IEsqlAsyncResponse
+{
+	private readonly StreamResponse _response;
+
+	public EsqlTransportAsyncResponse(StreamResponse response)
+	{
+		_response = response;
+		Body = PipeReader.Create(response.Body);
+	}
+
+	public PipeReader Body { get; }
+
+	public async ValueTask DisposeAsync()
+	{
+		await Body.CompleteAsync().ConfigureAwait(false);
+		_response.Dispose();
+	}
+}
+#else
+internal sealed class EsqlTransportAsyncResponse : IEsqlAsyncResponse
+{
+	private readonly StreamResponse _response;
+
+	public EsqlTransportAsyncResponse(StreamResponse response) => _response = response;
+
+	public Stream Body => _response.Body;
+
+	public ValueTask DisposeAsync()
+	{
+		_response.Dispose();
+		return default;
+	}
+}
+#endif

src/Elastic.Clients.Elasticsearch/_Shared/Api/Esql/EsqlQueryOptions.cs

@@ -0,0 +1,40 @@
+// Licensed to Elasticsearch B.V under one or more agreements.
+// Elasticsearch B.V licenses this file to you under the Apache 2.0 License.
+// See the LICENSE file in the project root for more information.
+
+using System.Collections.Generic;
+
+using Elastic.Transport;
+
+namespace Elastic.Clients.Elasticsearch.Esql;
+
+/// <summary>Per-query options for LINQ-to-ES|QL queries executed via WithOptions.</summary>
+public sealed record EsqlQueryOptions
+{
+	/// <summary>Per-request transport configuration (timeouts, headers, auth).</summary>
+	public IRequestConfiguration? RequestConfiguration { get; init; }
+
+	/// <summary>If true, partial results will be returned on shard failures.</summary>
+	public bool? AllowPartialResults { get; init; }
+
+	/// <summary>If true, entirely null columns are removed from the response.</summary>
+	public bool? DropNullColumns { get; init; }
+
+	/// <summary>A Query DSL filter applied to the document set before the ES|QL query runs.</summary>
+	public QueryDsl.Query? Filter { get; init; }
+
+	/// <summary>Locale for result formatting (e.g., "en-US").</summary>
+	public string? Locale { get; init; }
+
+	/// <summary>Project routing for serverless cross-project queries.</summary>
+	public string? ProjectRouting { get; init; }
+
+	/// <summary>Default timezone for date operations (e.g., "UTC").</summary>
+	public string? TimeZone { get; init; }
+
+	/// <summary>
+	/// User-supplied named parameters. Merged with parameters from the translated query.
+	/// If a key exists in both, NamedParameters takes precedence.
+	/// </summary>
+	public Dictionary<string, FieldValue>? NamedParameters { get; init; }
+}

src/Elastic.Clients.Elasticsearch/_Shared/Api/Esql/EsqlQueryableExtensions.cs

@@ -0,0 +1,22 @@
+// Licensed to Elasticsearch B.V under one or more agreements.
+// Elasticsearch B.V licenses this file to you under the Apache 2.0 License.
+// See the LICENSE file in the project root for more information.
+
+using System;
+using System.Linq.Expressions;
+
+using Elastic.Esql.Core;
+
+namespace Elastic.Clients.Elasticsearch.Esql;
+
+/// <summary>Extension methods for attaching query options to LINQ-to-ES|QL queries.</summary>
+public static class EsqlQueryableExtensions
+{
+	/// <summary>Attaches ES|QL query options to the query pipeline.</summary>
+	public static IEsqlQueryable<T> WithOptions<T>(this IEsqlQueryable<T> source, EsqlQueryOptions options)
+	{
+		var method = new Func<IEsqlQueryable<T>, EsqlQueryOptions, IEsqlQueryable<T>>(WithOptions).Method;
+		return (IEsqlQueryable<T>)source.Provider.CreateQuery<T>(
+			Expression.Call(null, method, source.Expression, Expression.Constant(options)));
+	}
+}

src/Elastic.Clients.Elasticsearch/_Shared/Api/Esql/EsqlSourceInferenceInterceptor.cs

@@ -0,0 +1,24 @@
+// Licensed to Elasticsearch B.V under one or more agreements.
+// Elasticsearch B.V licenses this file to you under the Apache 2.0 License.
+// See the LICENSE file in the project root for more information.
+
+using Elastic.Esql.Core;
+using Elastic.Esql.QueryModel;
+
+namespace Elastic.Clients.Elasticsearch.Esql;
+
+internal sealed class EsqlSourceInferenceInterceptor : IEsqlQueryInterceptor
+{
+	private readonly Inferrer _inferrer;
+
+	public EsqlSourceInferenceInterceptor(Inferrer inferrer) => _inferrer = inferrer;
+
+	public EsqlQuery Intercept(EsqlQuery query)
+	{
+		if (query.Source is not null)
+			return query;
+
+		var indexName = _inferrer.IndexName(query.ElementType);
+		return query.WithSource(indexName);
+	}
+}