Cleanup Duplicate Constants in Snapshot XContent Params (#74114) (#74191)

No need to have duplicate versions of these in `SnapshotInfo`.

Author: original-brownbear

server/src/main/java/org/elasticsearch/repositories/blobstore/ChecksumBlobStoreFormat.java

@@ -34,34 +34,26 @@
 import org.elasticsearch.core.CheckedConsumer;
 import org.elasticsearch.core.CheckedFunction;
 import org.elasticsearch.gateway.CorruptStateException;
-import org.elasticsearch.snapshots.SnapshotInfo;
 
 import java.io.FilterInputStream;
 import java.io.IOException;
 import java.io.InputStream;
 import java.io.OutputStream;
-import java.util.HashMap;
+import java.util.Collections;
 import java.util.Locale;
-import java.util.Map;
 import java.util.zip.CRC32;
 
 /**
  * Snapshot metadata file format used in v2.0 and above
  */
 public final class ChecksumBlobStoreFormat<T extends ToXContent> {
 
-    // Serialization parameters to specify correct context for metadata serialization
-    public static final ToXContent.Params SNAPSHOT_ONLY_FORMAT_PARAMS;
-
-    static {
-        Map<String, String> snapshotOnlyParams = new HashMap<>();
-        // when metadata is serialized certain elements of the metadata shouldn't be included into snapshot
-        // exclusion of these elements is done by setting Metadata.CONTEXT_MODE_PARAM to Metadata.CONTEXT_MODE_SNAPSHOT
-        snapshotOnlyParams.put(Metadata.CONTEXT_MODE_PARAM, Metadata.CONTEXT_MODE_SNAPSHOT);
-        // serialize SnapshotInfo using the SNAPSHOT mode
-        snapshotOnlyParams.put(SnapshotInfo.CONTEXT_MODE_PARAM, SnapshotInfo.CONTEXT_MODE_SNAPSHOT);
-        SNAPSHOT_ONLY_FORMAT_PARAMS = new ToXContent.MapParams(snapshotOnlyParams);
-    }
+    // Serialization parameters to specify correct context for metadata serialization.
+    // When metadata is serialized certain elements of the metadata shouldn't be included into snapshot
+    // exclusion of these elements is done by setting Metadata.CONTEXT_MODE_PARAM to Metadata.CONTEXT_MODE_SNAPSHOT
+    public static final ToXContent.Params SNAPSHOT_ONLY_FORMAT_PARAMS = new ToXContent.MapParams(
+        Collections.singletonMap(Metadata.CONTEXT_MODE_PARAM, Metadata.CONTEXT_MODE_SNAPSHOT)
+    );
 
     // The format version
     public static final int VERSION = 1;

server/src/main/java/org/elasticsearch/snapshots/SnapshotInfo.java

@@ -11,6 +11,7 @@
 import org.elasticsearch.action.ShardOperationFailedException;
 import org.elasticsearch.action.admin.cluster.snapshots.get.GetSnapshotsRequest;
 import org.elasticsearch.cluster.SnapshotsInProgress;
+import org.elasticsearch.cluster.metadata.Metadata;
 import org.elasticsearch.common.io.stream.StreamInput;
 import org.elasticsearch.common.io.stream.StreamOutput;
 import org.elasticsearch.common.io.stream.Writeable;
@@ -50,8 +51,6 @@ public final class SnapshotInfo implements Comparable<SnapshotInfo>, ToXContent,
 
     public static final Version METADATA_FIELD_INTRODUCED = Version.V_7_3_0;
 
-    public static final String CONTEXT_MODE_PARAM = "context_mode";
-    public static final String CONTEXT_MODE_SNAPSHOT = "SNAPSHOT";
     public static final String INDEX_DETAILS_XCONTENT_PARAM = "index_details";
 
     private static final DateFormatter DATE_TIME_FORMATTER = DateFormatter.forPattern("strict_date_optional_time");
@@ -720,7 +719,7 @@ public RestStatus status() {
     @Override
     public XContentBuilder toXContent(final XContentBuilder builder, final Params params) throws IOException {
         // write snapshot info to repository snapshot blob format
-        if (CONTEXT_MODE_SNAPSHOT.equals(params.param(CONTEXT_MODE_PARAM))) {
+        if (Metadata.CONTEXT_MODE_SNAPSHOT.equals(params.param(Metadata.CONTEXT_MODE_PARAM))) {
             return toXContentInternal(builder, params);
         }