[CCR] Add monitoring mapping verification test (#33662)

Added test that verifies that all fields in ShardFollowNodeTaskStatus are
mapped in monitoring-es.json

Author: martijnvg

x-pack/plugin/monitoring/src/test/java/org/elasticsearch/xpack/monitoring/collector/ccr/CcrStatsMonitoringDocTests.java

@@ -7,26 +7,34 @@
 package org.elasticsearch.xpack.monitoring.collector.ccr;
 
 import org.elasticsearch.ElasticsearchException;
+import org.elasticsearch.common.Strings;
 import org.elasticsearch.common.bytes.BytesReference;
+import org.elasticsearch.common.xcontent.XContentBuilder;
 import org.elasticsearch.common.xcontent.XContentHelper;
 import org.elasticsearch.common.xcontent.XContentType;
+import org.elasticsearch.common.xcontent.support.XContentMapValues;
 import org.elasticsearch.xpack.core.ccr.ShardFollowNodeTaskStatus;
 import org.elasticsearch.xpack.core.monitoring.MonitoredSystem;
 import org.elasticsearch.xpack.core.monitoring.exporter.MonitoringDoc;
+import org.elasticsearch.xpack.core.monitoring.exporter.MonitoringTemplateUtils;
 import org.elasticsearch.xpack.monitoring.exporter.BaseMonitoringDocTestCase;
 import org.joda.time.DateTime;
 import org.joda.time.DateTimeZone;
 import org.junit.Before;
 
 import java.io.IOException;
 import java.util.Collections;
+import java.util.Map;
 import java.util.NavigableMap;
 import java.util.TreeMap;
 
+import static org.elasticsearch.common.xcontent.XContentFactory.jsonBuilder;
+import static org.hamcrest.Matchers.anyOf;
 import static org.hamcrest.Matchers.containsString;
 import static org.hamcrest.Matchers.equalTo;
 import static org.hamcrest.Matchers.hasToString;
 import static org.hamcrest.Matchers.is;
+import static org.hamcrest.Matchers.notNullValue;
 import static org.hamcrest.Matchers.nullValue;
 import static org.mockito.Mockito.mock;
 
@@ -174,4 +182,65 @@ public void testToXContent() throws IOException {
                         + "}"));
     }
 
+    public void testShardFollowNodeTaskStatusFieldsMapped() throws IOException {
+        final NavigableMap<Long, ElasticsearchException> fetchExceptions =
+            new TreeMap<>(Collections.singletonMap(1L, new ElasticsearchException("shard is sad")));
+        final ShardFollowNodeTaskStatus status = new ShardFollowNodeTaskStatus(
+            "cluster_alias:leader_index",
+            "follower_index",
+            0,
+            1,
+            1,
+            1,
+            1,
+            1,
+            1,
+            1,
+            1,
+            1,
+            100,
+            10,
+            0,
+            10,
+            100,
+            10,
+            10,
+            0,
+            10,
+            fetchExceptions,
+            2);
+        XContentBuilder builder = jsonBuilder();
+        builder.value(status);
+        Map<String, Object> serializedStatus = XContentHelper.convertToMap(XContentType.JSON.xContent(), Strings.toString(builder), false);
+
+        Map<String, Object> template =
+            XContentHelper.convertToMap(XContentType.JSON.xContent(), MonitoringTemplateUtils.loadTemplate("es"), false);
+        Map<?, ?> ccrStatsMapping = (Map<?, ?>) XContentMapValues.extractValue("mappings.doc.properties.ccr_stats.properties", template);
+
+        assertThat(serializedStatus.size(), equalTo(ccrStatsMapping.size()));
+        for (Map.Entry<String, Object> entry : serializedStatus.entrySet()) {
+            String fieldName = entry.getKey();
+            Map<?, ?> fieldMapping = (Map<?, ?>) ccrStatsMapping.get(fieldName);
+            assertThat(fieldMapping, notNullValue());
+
+            Object fieldValue = entry.getValue();
+            String fieldType = (String) fieldMapping.get("type");
+            if (fieldValue instanceof Long || fieldValue instanceof Integer) {
+                assertThat("expected long field type for field [" + fieldName + "]", fieldType,
+                    anyOf(equalTo("long"), equalTo("integer")));
+            } else if (fieldValue instanceof String) {
+                assertThat("expected keyword field type for field [" + fieldName + "]", fieldType,
+                    anyOf(equalTo("keyword"), equalTo("text")));
+            } else {
+                // Manual test specific object fields and if not just fail:
+                if (fieldName.equals("fetch_exceptions")) {
+                    assertThat(XContentMapValues.extractValue("properties.from_seq_no.type", fieldMapping), equalTo("long"));
+                    assertThat(XContentMapValues.extractValue("properties.exception.type", fieldMapping), equalTo("text"));
+                } else {
+                    fail("unexpected field value type [" + fieldValue.getClass() + "] for field [" + fieldName + "]");
+                }
+            }
+        }
+    }
+
 }