deprecation info API: 'fix' value for index.shard.check_on_startup

This commit adds support to check for a value of 'fix' for the index setting
`index.shard.check_on_startup` for the deprecation info API. This is no longer
a valid value for this setting.

relates elastic#36024
relates elastic#33194

Author: jakelandis

x-pack/plugin/deprecation/src/main/java/org/elasticsearch/xpack/deprecation/DeprecationChecks.java

@@ -48,7 +48,8 @@ private DeprecationChecks() {
         Collections.unmodifiableList(Arrays.asList(
             IndexDeprecationChecks::oldIndicesCheck,
             IndexDeprecationChecks::delimitedPayloadFilterCheck,
-            IndexDeprecationChecks::indexNameCheck
+            IndexDeprecationChecks::indexNameCheck,
+            IndexDeprecationChecks::shardOnStartupCheck
             ));
 
     /**

x-pack/plugin/deprecation/src/main/java/org/elasticsearch/xpack/deprecation/IndexDeprecationChecks.java

@@ -11,7 +11,9 @@
 import org.elasticsearch.Version;
 import org.elasticsearch.cluster.metadata.IndexMetaData;
 import org.elasticsearch.cluster.metadata.MappingMetaData;
+import org.elasticsearch.common.Strings;
 import org.elasticsearch.common.settings.Settings;
+import org.elasticsearch.index.IndexSettings;
 import org.elasticsearch.index.analysis.AnalysisRegistry;
 import org.elasticsearch.xpack.core.deprecation.DeprecationIssue;
 
@@ -116,4 +118,21 @@ static DeprecationIssue indexNameCheck(IndexMetaData indexMetaData) {
         }
         return null;
     }
+
+    static DeprecationIssue shardOnStartupCheck(IndexMetaData indexMetaData) {
+        String setting = IndexSettings.INDEX_CHECK_ON_STARTUP.getKey();
+        String value = indexMetaData.getSettings().get(setting);
+        if (Strings.isNullOrEmpty(value) == false) {
+            if ("fix".equalsIgnoreCase(value)) {
+                return new DeprecationIssue(DeprecationIssue.Level.WARNING,
+                    "The value 'fix' for setting index.shard.check_on_startup is no longer valid",
+                    "https://www.elastic.co/guide/en/elasticsearch/reference/master/breaking-changes-7.0.html" +
+                        "#_literal_fix_literal_value_for_literal_index_shard_check_on_startup_literal_is_removed",
+                    "The index [" + indexMetaData.getIndex().getName() + "] has the setting index.shard.check_on_startup = 'fix'. " +
+                        "Valid values are 'true', 'false', and 'checksum'");
+            }
+        }
+        return null;
+    }
 }
+

x-pack/plugin/deprecation/src/test/java/org/elasticsearch/xpack/deprecation/IndexDeprecationChecksTests.java

@@ -8,6 +8,7 @@
 import org.elasticsearch.Version;
 import org.elasticsearch.cluster.metadata.IndexMetaData;
 import org.elasticsearch.common.settings.Settings;
+import org.elasticsearch.index.IndexSettings;
 import org.elasticsearch.test.ESTestCase;
 import org.elasticsearch.test.VersionUtils;
 import org.elasticsearch.xpack.core.deprecation.DeprecationInfoAction;
@@ -76,4 +77,29 @@ public void testIndexNameCheck(){
         List<DeprecationIssue> noIssues = DeprecationChecks.filterChecks(INDEX_SETTINGS_CHECKS, c -> c.apply(goodIndex));
         assertTrue(noIssues.isEmpty());
     }
+
+    public void testShardOnStartupCheck() {
+        String indexName = randomAlphaOfLengthBetween(0, 10);
+        final IndexMetaData badIndex = IndexMetaData.builder(indexName)
+            .settings(settings(Version.CURRENT).put(IndexSettings.INDEX_CHECK_ON_STARTUP.getKey(), "fix"))
+            .numberOfShards(randomIntBetween(1, 100))
+            .numberOfReplicas(randomIntBetween(1, 15))
+            .build();
+        DeprecationIssue expected = new DeprecationIssue(DeprecationIssue.Level.WARNING,
+            "The value 'fix' for setting index.shard.check_on_startup is no longer valid",
+            "https://www.elastic.co/guide/en/elasticsearch/reference/master/breaking-changes-7.0.html" +
+                "#_literal_fix_literal_value_for_literal_index_shard_check_on_startup_literal_is_removed",
+            "The index [" + indexName + "] has the setting index.shard.check_on_startup = 'fix'. " +
+                "Valid values are 'true', 'false', and 'checksum'");
+        List<DeprecationIssue> issues = DeprecationChecks.filterChecks(INDEX_SETTINGS_CHECKS, c -> c.apply(badIndex));
+        assertEquals(singletonList(expected), issues);
+        final IndexMetaData goodIndex = IndexMetaData.builder(indexName)
+            .settings(settings(Version.CURRENT))
+            .numberOfShards(randomIntBetween(1, 100))
+            .numberOfReplicas(randomIntBetween(1, 15))
+            .build();
+        List<DeprecationIssue> noIssues = DeprecationChecks.filterChecks(INDEX_SETTINGS_CHECKS, c -> c.apply(goodIndex));
+        assertTrue(noIssues.isEmpty());
+    }
+
 }