Remove the 6.7 version constants. (#42039)

This PR removes all constants of the form `Version.V_6_7_*`, since master no
longer needs to account for them.

Relates to #41164.

modules/reindex/src/main/java/org/elasticsearch/index/reindex/TransportUpdateByQueryAction.java

@@ -20,7 +20,6 @@
 package org.elasticsearch.index.reindex;
 
 import org.apache.logging.log4j.Logger;
-import org.elasticsearch.Version;
 import org.elasticsearch.action.ActionListener;
 import org.elasticsearch.action.index.IndexRequest;
 import org.elasticsearch.action.support.ActionFilters;
@@ -82,18 +81,13 @@ protected void doExecute(Task task, UpdateByQueryRequest request, ActionListener
      */
     static class AsyncIndexBySearchAction extends AbstractAsyncBulkByScrollAction<UpdateByQueryRequest, TransportUpdateByQueryAction> {
 
-        private final boolean useSeqNoForCAS;
-
         AsyncIndexBySearchAction(BulkByScrollTask task, Logger logger, ParentTaskAssigningClient client,
                 ThreadPool threadPool, TransportUpdateByQueryAction action, UpdateByQueryRequest request, ClusterState clusterState,
                 ActionListener<BulkByScrollResponse> listener) {
             super(task,
-                // not all nodes support sequence number powered optimistic concurrency control, we fall back to version
-                clusterState.nodes().getMinNodeVersion().onOrAfter(Version.V_6_7_0) == false,
-                // all nodes support sequence number powered optimistic concurrency control and we can use it
-                clusterState.nodes().getMinNodeVersion().onOrAfter(Version.V_6_7_0),
+                // use sequence number powered optimistic concurrency control
+                false, true,
                 logger, client, threadPool, action, request, listener);
-            useSeqNoForCAS = clusterState.nodes().getMinNodeVersion().onOrAfter(Version.V_6_7_0);
         }
 
         @Override

server/src/main/java/org/elasticsearch/Build.java

@@ -254,12 +254,7 @@ public static void writeBuild(Build build, StreamOutput out) throws IOException
             out.writeString(build.flavor().displayName());
         }
         if (out.getVersion().onOrAfter(Version.V_6_3_0)) {
-            final Type buildType;
-            if (out.getVersion().before(Version.V_6_7_0) && build.type() == Type.DOCKER) {
-                buildType = Type.TAR;
-            } else {
-                buildType = build.type();
-            }
+            final Type buildType = build.type();
             out.writeString(buildType.displayName());
         }
         out.writeString(build.shortHash());

server/src/main/java/org/elasticsearch/ElasticsearchException.java

@@ -1010,19 +1010,19 @@ private enum ElasticsearchExceptionHandle {
         COORDINATION_STATE_REJECTED_EXCEPTION(org.elasticsearch.cluster.coordination.CoordinationStateRejectedException.class,
             org.elasticsearch.cluster.coordination.CoordinationStateRejectedException::new, 150, Version.V_7_0_0),
         SNAPSHOT_IN_PROGRESS_EXCEPTION(org.elasticsearch.snapshots.SnapshotInProgressException.class,
-            org.elasticsearch.snapshots.SnapshotInProgressException::new, 151, Version.V_6_7_0),
+            org.elasticsearch.snapshots.SnapshotInProgressException::new, 151, UNKNOWN_VERSION_ADDED),
         NO_SUCH_REMOTE_CLUSTER_EXCEPTION(org.elasticsearch.transport.NoSuchRemoteClusterException.class,
-            org.elasticsearch.transport.NoSuchRemoteClusterException::new, 152, Version.V_6_7_0),
+            org.elasticsearch.transport.NoSuchRemoteClusterException::new, 152, UNKNOWN_VERSION_ADDED),
         RETENTION_LEASE_ALREADY_EXISTS_EXCEPTION(
                 org.elasticsearch.index.seqno.RetentionLeaseAlreadyExistsException.class,
                 org.elasticsearch.index.seqno.RetentionLeaseAlreadyExistsException::new,
                 153,
-                Version.V_6_7_0),
+                UNKNOWN_VERSION_ADDED),
         RETENTION_LEASE_NOT_FOUND_EXCEPTION(
                 org.elasticsearch.index.seqno.RetentionLeaseNotFoundException.class,
                 org.elasticsearch.index.seqno.RetentionLeaseNotFoundException::new,
                 154,
-                Version.V_6_7_0),
+                UNKNOWN_VERSION_ADDED),
         SHARD_NOT_IN_PRIMARY_MODE_EXCEPTION(
                 org.elasticsearch.index.shard.ShardNotInPrimaryModeException.class,
                 org.elasticsearch.index.shard.ShardNotInPrimaryModeException::new,

server/src/main/java/org/elasticsearch/Version.java

@@ -78,12 +78,6 @@ public class Version implements Comparable<Version>, ToXContentFragment {
     public static final Version V_6_6_1 = new Version(V_6_6_1_ID, org.apache.lucene.util.Version.LUCENE_7_6_0);
     public static final int V_6_6_2_ID = 6060299;
     public static final Version V_6_6_2 = new Version(V_6_6_2_ID, org.apache.lucene.util.Version.LUCENE_7_6_0);
-    public static final int V_6_7_0_ID = 6070099;
-    public static final Version V_6_7_0 = new Version(V_6_7_0_ID, org.apache.lucene.util.Version.LUCENE_7_7_0);
-    public static final int V_6_7_1_ID = 6070199;
-    public static final Version V_6_7_1 = new Version(V_6_7_1_ID, org.apache.lucene.util.Version.LUCENE_7_7_0);
-    public static final int V_6_7_2_ID = 6070299;
-    public static final Version V_6_7_2 = new Version(V_6_7_2_ID, org.apache.lucene.util.Version.LUCENE_7_7_0);
     public static final int V_6_8_0_ID = 6080099;
     public static final Version V_6_8_0 = new Version(V_6_8_0_ID, org.apache.lucene.util.Version.LUCENE_7_7_0);
     public static final int V_6_8_1_ID = 6080199;
@@ -130,12 +124,6 @@ public static Version fromId(int id) {
                 return V_6_8_1;
             case V_6_8_0_ID:
                 return V_6_8_0;
-            case V_6_7_1_ID:
-                return V_6_7_1;
-            case V_6_7_2_ID:
-                return V_6_7_2;
-            case V_6_7_0_ID:
-                return V_6_7_0;
             case V_6_6_2_ID:
                 return V_6_6_2;
             case V_6_6_1_ID:

server/src/main/java/org/elasticsearch/index/engine/ReadOnlyEngine.java

@@ -131,7 +131,7 @@ protected void ensureMaxSeqNoEqualsToGlobalCheckpoint(final SeqNoStats seqNoStat
         // that guarantee that all operations have been flushed to Lucene.
         final Version indexVersionCreated = engineConfig.getIndexSettings().getIndexVersionCreated();
         if (indexVersionCreated.onOrAfter(Version.V_7_2_0) ||
-            (seqNoStats.getGlobalCheckpoint() != SequenceNumbers.UNASSIGNED_SEQ_NO && indexVersionCreated.onOrAfter(Version.V_6_7_0))) {
+            (seqNoStats.getGlobalCheckpoint() != SequenceNumbers.UNASSIGNED_SEQ_NO)) {
             if (seqNoStats.getMaxSeqNo() != seqNoStats.getGlobalCheckpoint()) {
                 throw new IllegalStateException("Maximum sequence number [" + seqNoStats.getMaxSeqNo()
                     + "] from last commit does not match global checkpoint [" + seqNoStats.getGlobalCheckpoint() + "]");

server/src/main/java/org/elasticsearch/indices/recovery/RecoverySourceHandler.java

@@ -30,7 +30,6 @@
 import org.apache.lucene.store.RateLimiter;
 import org.apache.lucene.util.ArrayUtil;
 import org.elasticsearch.ExceptionsHelper;
-import org.elasticsearch.Version;
 import org.elasticsearch.action.ActionListener;
 import org.elasticsearch.action.StepListener;
 import org.elasticsearch.cluster.routing.IndexShardRoutingTable;
@@ -112,8 +111,7 @@ public RecoverySourceHandler(final IndexShard shard, RecoveryTargetHandler recov
         this.shardId = this.request.shardId().id();
         this.logger = Loggers.getLogger(getClass(), request.shardId(), "recover to " + request.targetNode().getName());
         this.chunkSizeInBytes = fileChunkSizeInBytes;
-        // if the target is on an old version, it won't be able to handle out-of-order file chunks.
-        this.maxConcurrentFileChunks = request.targetNode().getVersion().onOrAfter(Version.V_6_7_0) ? maxConcurrentFileChunks : 1;
+        this.maxConcurrentFileChunks = maxConcurrentFileChunks;
     }
 
     public StartRecoveryRequest getRequest() {

server/src/test/java/org/elasticsearch/BuildTests.java

@@ -30,7 +30,6 @@
 import java.io.InputStream;
 import java.net.URL;
 import java.util.Arrays;
-import java.util.List;
 import java.util.Objects;
 import java.util.Set;
 import java.util.stream.Collectors;
@@ -193,35 +192,7 @@ public void testSerialization() {
                 throw new AssertionError();
             });
     }
-
-    public void testSerializationBWC() throws IOException {
-        final WriteableBuild dockerBuild = new WriteableBuild(new Build(randomFrom(Build.Flavor.values()), Build.Type.DOCKER,
-            randomAlphaOfLength(6), randomAlphaOfLength(6), randomBoolean(), randomAlphaOfLength(6)));
-
-        final List<Version> versions = Version.getDeclaredVersions(Version.class);
-        final Version post63Pre67Version = randomFrom(versions.stream()
-            .filter(v -> v.onOrAfter(Version.V_6_3_0) && v.before(Version.V_6_7_0)).collect(Collectors.toList()));
-        final Version post67Pre70Version = randomFrom(versions.stream()
-            .filter(v -> v.onOrAfter(Version.V_6_7_0) && v.before(Version.V_7_0_0)).collect(Collectors.toList()));
-        final Version post70Version = randomFrom(versions.stream().filter(v -> v.onOrAfter(Version.V_7_0_0)).collect(Collectors.toList()));
-
-        final WriteableBuild post63pre67 = copyWriteable(dockerBuild, writableRegistry(), WriteableBuild::new, post63Pre67Version);
-        final WriteableBuild post67pre70 = copyWriteable(dockerBuild, writableRegistry(), WriteableBuild::new, post67Pre70Version);
-        final WriteableBuild post70 = copyWriteable(dockerBuild, writableRegistry(), WriteableBuild::new, post70Version);
-
-        assertThat(post63pre67.build.flavor(), equalTo(dockerBuild.build.flavor()));
-        assertThat(post67pre70.build.flavor(), equalTo(dockerBuild.build.flavor()));
-        assertThat(post70.build.flavor(), equalTo(dockerBuild.build.flavor()));
-
-        assertThat(post63pre67.build.type(), equalTo(Build.Type.TAR));
-        assertThat(post67pre70.build.type(), equalTo(dockerBuild.build.type()));
-        assertThat(post70.build.type(), equalTo(dockerBuild.build.type()));
-
-        assertThat(post63pre67.build.getQualifiedVersion(), equalTo(post63Pre67Version.toString()));
-        assertThat(post67pre70.build.getQualifiedVersion(), equalTo(post67Pre70Version.toString()));
-        assertThat(post70.build.getQualifiedVersion(), equalTo(dockerBuild.build.getQualifiedVersion()));
-    }
-
+
     public void testFlavorParsing() {
         for (final Build.Flavor flavor : Build.Flavor.values()) {
             // strict or not should not impact parsing at all here

server/src/test/java/org/elasticsearch/ExceptionSerializationTests.java

@@ -888,7 +888,7 @@ public void testShardLockObtainFailedException() throws IOException {
 
     public void testSnapshotInProgressException() throws IOException {
         SnapshotInProgressException orig = new SnapshotInProgressException("boom");
-        Version version = VersionUtils.randomVersionBetween(random(), Version.V_6_7_0, Version.CURRENT);
+        Version version = VersionUtils.randomIndexCompatibleVersion(random());
         SnapshotInProgressException ex = serialize(orig, version);
         assertEquals(orig.getMessage(), ex.getMessage());
     }

server/src/test/java/org/elasticsearch/VersionTests.java

@@ -346,7 +346,6 @@ public static void assertUnknownVersion(Version version) {
     public void testIsCompatible() {
         assertTrue(isCompatible(Version.CURRENT, Version.CURRENT.minimumCompatibilityVersion()));
         assertFalse(isCompatible(Version.V_6_6_0, Version.V_7_0_0));
-        assertFalse(isCompatible(Version.V_6_7_0, Version.V_7_0_0));
         assertTrue(isCompatible(Version.V_6_8_0, Version.V_7_0_0));
         assertFalse(isCompatible(Version.fromId(2000099), Version.V_7_0_0));
         assertFalse(isCompatible(Version.fromId(2000099), Version.V_6_5_0));

server/src/test/java/org/elasticsearch/cluster/action/shard/ShardStateActionTests.java

@@ -519,11 +519,7 @@ public void testStartedShardEntrySerialization() throws Exception {
             final StartedShardEntry deserialized = new StartedShardEntry(in);
             assertThat(deserialized.shardId, equalTo(shardId));
             assertThat(deserialized.allocationId, equalTo(allocationId));
-            if (version.onOrAfter(Version.V_6_7_0)) {
-                assertThat(deserialized.primaryTerm, equalTo(primaryTerm));
-            } else {
-                assertThat(deserialized.primaryTerm, equalTo(0L));
-            }
+            assertThat(deserialized.primaryTerm, equalTo(primaryTerm));
             assertThat(deserialized.message, equalTo(message));
         }
     }

server/src/test/java/org/elasticsearch/cluster/block/ClusterBlockTests.java

@@ -130,7 +130,7 @@ private ClusterBlock randomClusterBlock() {
     }
 
     private ClusterBlock randomClusterBlock(final Version version) {
-        final String uuid = (version.onOrAfter(Version.V_6_7_0) && randomBoolean()) ? UUIDs.randomBase64UUID() : null;
+        final String uuid = randomBoolean() ? UUIDs.randomBase64UUID() : null;
         final List<ClusterBlockLevel> levels = Arrays.asList(ClusterBlockLevel.values());
         return new ClusterBlock(randomInt(), uuid, "cluster block #" + randomInt(), randomBoolean(), randomBoolean(), randomBoolean(),
             randomFrom(RestStatus.values()), copyOf(randomSubsetOf(randomIntBetween(1, levels.size()), levels)));

x-pack/plugin/core/src/main/java/org/elasticsearch/xpack/core/ccr/AutoFollowStats.java

@@ -116,15 +116,9 @@ public AutoFollowStats(StreamInput in) throws IOException {
         numberOfFailedFollowIndices = in.readVLong();
         numberOfFailedRemoteClusterStateRequests = in.readVLong();
         numberOfSuccessfulFollowIndices = in.readVLong();
-        if (in.getVersion().onOrAfter(Version.V_6_7_0)) {
-            // note: the casts to the following Writeable.Reader<T> instances are needed by some IDEs (e.g. Eclipse 4.8) as a compiler help
-            recentAutoFollowErrors = new TreeMap<>(in.readMap((Writeable.Reader<String>) StreamInput::readString,
-                    (Writeable.Reader<Tuple<Long, ElasticsearchException>>) in1 -> new Tuple<>(in1.readZLong(), in1.readException())));
-        } else {
-            // note: the casts to the following Writeable.Reader<T> instances are needed by some IDEs (e.g. Eclipse 4.8) as a compiler help
-            recentAutoFollowErrors = new TreeMap<>(in.readMap((Writeable.Reader<String>) StreamInput::readString,
-                    (Writeable.Reader<Tuple<Long, ElasticsearchException>>) in1 -> new Tuple<>(-1L, in1.readException())));
-        }
+        // note: the casts to the following Writeable.Reader<T> instances are needed by some IDEs (e.g. Eclipse 4.8) as a compiler help
+        recentAutoFollowErrors = new TreeMap<>(in.readMap((Writeable.Reader<String>) StreamInput::readString,
+                (Writeable.Reader<Tuple<Long, ElasticsearchException>>) in1 -> new Tuple<>(in1.readZLong(), in1.readException())));
         if (in.getVersion().onOrAfter(Version.V_6_6_0)) {
             autoFollowedClusters = new TreeMap<>(in.readMap(StreamInput::readString, AutoFollowedCluster::new));
         } else {
@@ -137,14 +131,11 @@ public void writeTo(StreamOutput out) throws IOException {
         out.writeVLong(numberOfFailedFollowIndices);
         out.writeVLong(numberOfFailedRemoteClusterStateRequests);
         out.writeVLong(numberOfSuccessfulFollowIndices);
-        if (out.getVersion().onOrAfter(Version.V_6_7_0)) {
-            out.writeMap(recentAutoFollowErrors, StreamOutput::writeString, (out1, value) -> {
-                out1.writeZLong(value.v1());
-                out1.writeException(value.v2());
-            });
-        } else {
-            out.writeMap(recentAutoFollowErrors, StreamOutput::writeString, (out1, value) -> out1.writeException(value.v2()));
-        }
+        out.writeMap(recentAutoFollowErrors, StreamOutput::writeString, (out1, value) -> {
+            out1.writeZLong(value.v1());
+            out1.writeException(value.v2());
+        });
+
         if (out.getVersion().onOrAfter(Version.V_6_6_0)) {
             out.writeMap(autoFollowedClusters, StreamOutput::writeString, (out1, value) -> value.writeTo(out1));
         }

x-pack/plugin/core/src/main/java/org/elasticsearch/xpack/core/ccr/action/PutAutoFollowPatternAction.java

@@ -5,14 +5,12 @@
  */
 package org.elasticsearch.xpack.core.ccr.action;
 
-import org.elasticsearch.Version;
 import org.elasticsearch.action.Action;
 import org.elasticsearch.action.ActionRequestValidationException;
 import org.elasticsearch.action.support.master.AcknowledgedRequest;
 import org.elasticsearch.action.support.master.AcknowledgedResponse;
 import org.elasticsearch.common.io.stream.StreamInput;
 import org.elasticsearch.common.io.stream.StreamOutput;
-import org.elasticsearch.common.unit.ByteSizeValue;
 import org.elasticsearch.common.xcontent.ObjectParser;
 import org.elasticsearch.common.xcontent.ToXContentObject;
 import org.elasticsearch.common.xcontent.XContentBuilder;
@@ -153,21 +151,7 @@ public Request(StreamInput in) throws IOException {
             remoteCluster = in.readString();
             leaderIndexPatterns = in.readStringList();
             followIndexNamePattern = in.readOptionalString();
-            if (in.getVersion().onOrAfter(Version.V_6_7_0)) {
-                parameters = new FollowParameters(in);
-            } else {
-                parameters = new FollowParameters();
-                parameters.maxReadRequestOperationCount = in.readOptionalVInt();
-                parameters.maxReadRequestSize = in.readOptionalWriteable(ByteSizeValue::new);
-                parameters.maxOutstandingReadRequests = in.readOptionalVInt();
-                parameters.maxWriteRequestOperationCount = in.readOptionalVInt();
-                parameters.maxWriteRequestSize = in.readOptionalWriteable(ByteSizeValue::new);
-                parameters.maxOutstandingWriteRequests = in.readOptionalVInt();
-                parameters.maxWriteBufferCount = in.readOptionalVInt();
-                parameters.maxWriteBufferSize = in.readOptionalWriteable(ByteSizeValue::new);
-                parameters.maxRetryDelay = in.readOptionalTimeValue();
-                parameters.readPollTimeout = in.readOptionalTimeValue();
-            }
+            parameters = new FollowParameters(in);
         }
 
         @Override
@@ -177,20 +161,7 @@ public void writeTo(StreamOutput out) throws IOException {
             out.writeString(remoteCluster);
             out.writeStringCollection(leaderIndexPatterns);
             out.writeOptionalString(followIndexNamePattern);
-            if (out.getVersion().onOrAfter(Version.V_6_7_0)) {
-                parameters.writeTo(out);
-            } else {
-                out.writeOptionalVInt(parameters.maxReadRequestOperationCount);
-                out.writeOptionalWriteable(parameters.maxReadRequestSize);
-                out.writeOptionalVInt(parameters.maxOutstandingReadRequests);
-                out.writeOptionalVInt(parameters.maxWriteRequestOperationCount);
-                out.writeOptionalWriteable(parameters.maxWriteRequestSize);
-                out.writeOptionalVInt(parameters.maxOutstandingWriteRequests);
-                out.writeOptionalVInt(parameters.maxWriteBufferCount);
-                out.writeOptionalWriteable(parameters.maxWriteBufferSize);
-                out.writeOptionalTimeValue(parameters.maxRetryDelay);
-                out.writeOptionalTimeValue(parameters.readPollTimeout);
-            }
+            parameters.writeTo(out);
         }
 
         @Override

x-pack/plugin/core/src/main/java/org/elasticsearch/xpack/core/ccr/action/PutFollowAction.java

@@ -6,7 +6,6 @@
 
 package org.elasticsearch.xpack.core.ccr.action;
 
-import org.elasticsearch.Version;
 import org.elasticsearch.action.Action;
 import org.elasticsearch.action.ActionRequestValidationException;
 import org.elasticsearch.action.ActionResponse;
@@ -169,9 +168,7 @@ public Request(StreamInput in) throws IOException {
             this.leaderIndex = in.readString();
             this.followerIndex = in.readString();
             this.parameters = new FollowParameters(in);
-            if (in.getVersion().onOrAfter(Version.V_6_7_0)) {
-                waitForActiveShards(ActiveShardCount.readFrom(in));
-            }
+            waitForActiveShards(ActiveShardCount.readFrom(in));
         }
 
         @Override
@@ -181,9 +178,7 @@ public void writeTo(StreamOutput out) throws IOException {
             out.writeString(leaderIndex);
             out.writeString(followerIndex);
             parameters.writeTo(out);
-            if (out.getVersion().onOrAfter(Version.V_6_7_0)) {
-                waitForActiveShards.writeTo(out);
-            }
+            waitForActiveShards.writeTo(out);
         }
 
         @Override