Fix compiltaion issues in Swift 5.5

Author: 0xTim

Package.swift

@@ -16,6 +16,7 @@ let package = Package(
     ],
     dependencies: [
         .package(url: "https://github.com/swift-server/async-http-client.git", from: "1.0.0"),
+        .package(url: "https://github.com/apple/swift-nio.git", from: "2.33.0"),
     ],
     targets: [
         // Targets are the basic building blocks of a package. A target can define a module or a test suite.
@@ -24,6 +25,9 @@ let package = Package(
             name: "ElasticsearchNIOClient",
             dependencies: [
                 .product(name: "AsyncHTTPClient", package: "async-http-client"),
+                .product(name: "NIOCore", package: "swift-nio"),
+                .product(name: "NIOHTTP1", package: "swift-nio"),
+                .product(name: "NIOFoundationCompat", package: "swift-nio"),
             ]),
         .testTarget(
             name: "ElasticsearchNIOClientTests",

Sources/ElasticsearchNIOClient/ElasticsearchClient+Requests.swift

@@ -1,6 +1,7 @@
 import Foundation
 import NIO
 import NIOHTTP1
+import NIOFoundationCompat
 
 extension ElasticsearchClient {
     public func get<Document: Decodable>(id: String, from indexName: String) -> EventLoopFuture<ESGetSingleDocumentResponse<Document>> {

Sources/ElasticsearchNIOClient/ElasticsearchClient.swift

@@ -1,4 +1,5 @@
 import NIO
+import NIOFoundationCompat
 import AsyncHTTPClient
 import Foundation
 import Logging