Close exchanges in HttpClientTests (elastic#115059) (elastic#115460)

Author: joegallo

modules/ingest-geoip/src/test/java/org/elasticsearch/ingest/geoip/HttpClientTests.java

@@ -46,6 +46,7 @@ public static void startServer() throws Throwable {
         server.createContext("/404/", exchange -> {
             try {
                 exchange.sendResponseHeaders(404, 0);
+                exchange.close();
             } catch (Exception e) {
                 fail(e);
             }
@@ -101,6 +102,7 @@ public boolean checkCredentials(String username, String password) {
                     exchange.getResponseHeaders().add("Location", "/" + destination + "/");
                 }
                 exchange.sendResponseHeaders(302, 0);
+                exchange.close();
             } catch (Exception e) {
                 fail(e);
             }