Fix test, address reviewer comments.

Author: jbaiera

client/rest-high-level/src/test/java/org/elasticsearch/client/RequestConvertersTests.java

@@ -167,6 +167,7 @@
 import static org.hamcrest.CoreMatchers.equalTo;
 import static org.hamcrest.Matchers.hasEntry;
 import static org.hamcrest.Matchers.hasKey;
+import static org.hamcrest.Matchers.is;
 import static org.hamcrest.Matchers.notNullValue;
 import static org.hamcrest.Matchers.nullValue;
 
@@ -1958,12 +1959,15 @@ public void testSnapshotsStatus() {
         SnapshotsStatusRequest snapshotsStatusRequest = new SnapshotsStatusRequest(repository, snapshots);
         setRandomMasterTimeout(snapshotsStatusRequest, expectedParams);
         snapshotsStatusRequest.ignoreUnavailable(ignoreUnavailable);
-        expectedParams.put("ignore_unavailable", Boolean.toString(ignoreUnavailable));
+        if (ignoreUnavailable) {
+            expectedParams.put("ignore_unavailable", Boolean.toString(true));
+        }
 
         Request request = RequestConverters.snapshotsStatus(snapshotsStatusRequest);
         assertThat(request.getEndpoint(), equalTo(endpoint));
         assertThat(request.getMethod(), equalTo(HttpGet.METHOD_NAME));
         assertThat(request.getParameters(), equalTo(expectedParams));
+        assertThat(request.getEntity(), is(nullValue()));
     }
 
     public void testDeleteSnapshot() {