Fix NEGATIVE_INFINITY formatting, null password guard, and EventHandle placement

Author: srikanthpadakanti

data-prepper-plugins/opensearch/src/integrationTest/java/org/opensearch/dataprepper/plugins/sink/opensearch/OpenSearchSinkTsdbIT.java

@@ -467,7 +467,7 @@ private OpenSearchSinkConfig generateOpenSearchSinkConfig(final String indexType
         metadata.put("insecure", true);
         final String user = System.getProperty("tests.opensearch.user");
         final String password = System.getProperty("tests.opensearch.password");
-        if (user != null) {
+        if (user != null && password != null) {
             metadata.put(AUTHENTICATION, Map.of(USERNAME, user, PASSWORD, password));
         }
         final String distributionVersion = DeclaredOpenSearchVersion.OPENDISTRO_0_10.compareTo(

data-prepper-plugins/opensearch/src/main/java/org/opensearch/dataprepper/plugins/sink/opensearch/OpenSearchSink.java

@@ -484,7 +484,7 @@ public void doOutput(final Collection<Record<Event>> records) {
           for (int i = 0; i < tsdbDocs.size(); i++) {
             final SerializedJson doc = SerializedJson.fromStringAndOptionals(tsdbDocs.get(i), null, null, null);
             final BulkOperation op = getBulkOperationForAction(tsdbAction, doc, null, indexName, null);
-            final BulkOperationWrapper wrapper = (i == 0)
+            final BulkOperationWrapper wrapper = (i == tsdbDocs.size() - 1)
                     ? new BulkOperationWrapper(op, event.getEventHandle(), null, null)
                     : new BulkOperationWrapper(op, (EventHandle) null, null, null);
             wrappers.add(wrapper);

data-prepper-plugins/opensearch/src/main/java/org/opensearch/dataprepper/plugins/sink/opensearch/index/TSDBDocumentBuilder.java

@@ -252,6 +252,9 @@ private static String formatDouble(final Double value) {
         if (value == Double.POSITIVE_INFINITY) {
             return "+Inf";
         }
+        if (value == Double.NEGATIVE_INFINITY) {
+            return "-Inf";
+        }
         if (value == (long) value.doubleValue()) {
             return String.valueOf((long) value.doubleValue());
         }