Fix javadocs error

Signed-off-by: suranjay <surajkumar.tu@gmail.com>

modules/tracer-otel/src/main/java/org/opensearch/tracing/exporter/FileSpanExporter.java

@@ -22,13 +22,18 @@
  * will be written to a file. Tracing log file would be available in the logs directory.
  */
 public class FileSpanExporter implements SpanExporter {
-    public static final String TRACING_LOG_PREFIX = "tracing_log";
+    static final String TRACING_LOG_PREFIX = "tracing_log";
     private static final Logger TRACING_LOGGER = LogManager.getLogger(TRACING_LOG_PREFIX);
     private final Logger DEFAULT_LOGGER = LogManager.getLogger(FileSpanExporter.class);
     private final String FIELD_SEPARATOR = "\t";
 
     private final AtomicBoolean isShutdown = new AtomicBoolean();
 
+    /**
+     * No-args constructor
+     */
+    public FileSpanExporter() {}
+
     @Override
     public CompletableResultCode export(Collection<SpanData> spans) {
         if (isShutdown.get()) {

modules/tracer-otel/src/main/java/org/opensearch/tracing/exporter/package-info.java

@@ -0,0 +1,12 @@
+/*
+ * SPDX-License-Identifier: Apache-2.0
+ *
+ * The OpenSearch Contributors require contributions made to
+ * this file be licensed under the Apache-2.0 license or a
+ * compatible open source license.
+ */
+
+/**
+ * Contains span exporters
+ */
+package org.opensearch.tracing.exporter;