[FLINK-20711][docs] Fix failure-handler parameter enumeration value typo in ES connector doc

This closes #14467

docs/dev/table/connectors/elasticsearch.md

@@ -147,7 +147,7 @@ Connector Options
       <ul>
         <li><code>fail</code>: throws an exception if a request fails and thus causes a job failure.</li>
         <li><code>ignore</code>: ignores failures and drops the request.</li>
-        <li><code>retry_rejected</code>: re-adds requests that have failed due to queue capacity saturation.</li>
+        <li><code>retry-rejected</code>: re-adds requests that have failed due to queue capacity saturation.</li>
         <li>custom class name: for failure handling with a ActionRequestFailureHandler subclass.</li>
       </ul>
       </td>

docs/dev/table/connectors/elasticsearch.zh.md

@@ -147,7 +147,7 @@ Connector Options
       <ul>
         <li><code>fail</code>: throws an exception if a request fails and thus causes a job failure.</li>
         <li><code>ignore</code>: ignores failures and drops the request.</li>
-        <li><code>retry_rejected</code>: re-adds requests that have failed due to queue capacity saturation.</li>
+        <li><code>retry-rejected</code>: re-adds requests that have failed due to queue capacity saturation.</li>
         <li>custom class name: for failure handling with a ActionRequestFailureHandler subclass.</li>
       </ul>
       </td>

flink-connectors/flink-connector-elasticsearch-base/src/main/java/org/apache/flink/streaming/connectors/elasticsearch/table/ElasticsearchOptions.java

@@ -89,7 +89,7 @@ public class ElasticsearchOptions {
                                             text(
                                                     "\"ignore\" (ignores failures and drops the request),"),
                                             text(
-                                                    "\"retry_rejected\" (re-adds requests that have failed due to queue capacity saturation),"),
+                                                    "\"retry-rejected\" (re-adds requests that have failed due to queue capacity saturation),"),
                                             text(
                                                     "\"class name\" for failure handling with a ActionRequestFailureHandler subclass"))
                                     .build());