[chore][exporter/elasticsearch]Log errror logs on bench and fix EOF (#…

…33554)

**Description:** Benchmark didn't log errors before and issues would not
surface if something was failing during bench. Since benchmarks don't
assert the situation is made worse.

exporter/elasticsearchexporter/integrationtest/datareceiver.go

@@ -216,7 +216,7 @@ func (es *mockESReceiver) Start(ctx context.Context, host component.Host) error
 	})
 	r.HandleFunc("/_bulk", func(w http.ResponseWriter, r *http.Request) {
 		if !es.config.DecodeBulkRequests {
-			w.WriteHeader(http.StatusOK)
+			fmt.Fprintln(w, "{}")
 			return
 		}
 		_, response := docappendertest.DecodeBulkRequest(r)

exporter/elasticsearchexporter/integrationtest/exporter_bench_test.go

@@ -18,6 +18,8 @@ import (
 	"go.opentelemetry.io/collector/pdata/plog"
 	"go.opentelemetry.io/collector/pdata/pmetric"
 	"go.opentelemetry.io/collector/pdata/ptrace"
+	"go.uber.org/zap"
+	"go.uber.org/zap/zaptest"
 
 	"github.com/open-telemetry/opentelemetry-collector-contrib/exporter/elasticsearchexporter"
 	"github.com/open-telemetry/opentelemetry-collector-contrib/testbed/testbed"
@@ -52,9 +54,11 @@ func benchmarkLogs(b *testing.B, batchSize int, mappingMode string) {
 	ctx, cancel := context.WithCancel(context.Background())
 	defer cancel()
 
+	exporterSettings := exportertest.NewNopSettings()
+	exporterSettings.TelemetrySettings.Logger = zaptest.NewLogger(b, zaptest.Level(zap.WarnLevel))
 	runnerCfg := prepareBenchmark(b, batchSize, mappingMode)
 	exporter, err := runnerCfg.factory.CreateLogsExporter(
-		ctx, exportertest.NewNopSettings(), runnerCfg.esCfg,
+		ctx, exporterSettings, runnerCfg.esCfg,
 	)
 	require.NoError(b, err)
 	require.NoError(b, exporter.Start(ctx, componenttest.NewNopHost()))
@@ -79,9 +83,11 @@ func benchmarkTraces(b *testing.B, batchSize int, mappingMode string) {
 	ctx, cancel := context.WithCancel(context.Background())
 	defer cancel()
 
+	exporterSettings := exportertest.NewNopSettings()
+	exporterSettings.TelemetrySettings.Logger = zaptest.NewLogger(b, zaptest.Level(zap.WarnLevel))
 	runnerCfg := prepareBenchmark(b, batchSize, mappingMode)
 	exporter, err := runnerCfg.factory.CreateTracesExporter(
-		ctx, exportertest.NewNopSettings(), runnerCfg.esCfg,
+		ctx, exporterSettings, runnerCfg.esCfg,
 	)
 	require.NoError(b, err)
 	require.NoError(b, exporter.Start(ctx, componenttest.NewNopHost()))