diff --git a/core/src/main/java/org/elasticsearch/ElasticsearchException.java b/core/src/main/java/org/elasticsearch/ElasticsearchException.java
index 5d5a98ce3a9..9a690cb0500 100644
--- a/core/src/main/java/org/elasticsearch/ElasticsearchException.java
+++ b/core/src/main/java/org/elasticsearch/ElasticsearchException.java
@@ -984,11 +984,11 @@ public class ElasticsearchException extends RuntimeException implements ToXConte
         STATUS_EXCEPTION(org.elasticsearch.ElasticsearchStatusException.class, org.elasticsearch.ElasticsearchStatusException::new, 145,
             UNKNOWN_VERSION_ADDED),
         TASK_CANCELLED_EXCEPTION(org.elasticsearch.tasks.TaskCancelledException.class,
-            org.elasticsearch.tasks.TaskCancelledException::new, 146, Version.V_5_1_1_UNRELEASED),
+            org.elasticsearch.tasks.TaskCancelledException::new, 146, Version.V_5_1_1),
         SHARD_LOCK_OBTAIN_FAILED_EXCEPTION(org.elasticsearch.env.ShardLockObtainFailedException.class,
                                            org.elasticsearch.env.ShardLockObtainFailedException::new, 147, Version.V_5_0_2),
         UNKNOWN_NAMED_OBJECT_EXCEPTION(org.elasticsearch.common.xcontent.NamedXContentRegistry.UnknownNamedObjectException.class,
-                org.elasticsearch.common.xcontent.NamedXContentRegistry.UnknownNamedObjectException::new, 148, Version.V_5_2_0_UNRELEASED);
+                org.elasticsearch.common.xcontent.NamedXContentRegistry.UnknownNamedObjectException::new, 148, Version.V_5_2_0);
 
         final Class<? extends ElasticsearchException> exceptionClass;
         final CheckedFunction<StreamInput, ? extends ElasticsearchException, IOException> constructor;
diff --git a/core/src/main/java/org/elasticsearch/Version.java b/core/src/main/java/org/elasticsearch/Version.java
index 23b889ea592..e259bd9236a 100644
--- a/core/src/main/java/org/elasticsearch/Version.java
+++ b/core/src/main/java/org/elasticsearch/Version.java
@@ -100,18 +100,18 @@ public class Version implements Comparable<Version> {
     public static final int V_5_0_3_ID_UNRELEASED = 5000399;
     public static final Version V_5_0_3_UNRELEASED = new Version(V_5_0_3_ID_UNRELEASED, org.apache.lucene.util.Version.LUCENE_6_3_0);
     // no version constant for 5.1.0 due to inadvertent release
-    public static final int V_5_1_1_ID_UNRELEASED = 5010199;
-    public static final Version V_5_1_1_UNRELEASED = new Version(V_5_1_1_ID_UNRELEASED, org.apache.lucene.util.Version.LUCENE_6_3_0);
-    public static final int V_5_1_2_ID_UNRELEASED = 5010299;
-    public static final Version V_5_1_2_UNRELEASED = new Version(V_5_1_2_ID_UNRELEASED, org.apache.lucene.util.Version.LUCENE_6_3_0);
+    public static final int V_5_1_1_ID = 5010199;
+    public static final Version V_5_1_1 = new Version(V_5_1_1_ID, org.apache.lucene.util.Version.LUCENE_6_3_0);
+    public static final int V_5_1_2_ID = 5010299;
+    public static final Version V_5_1_2 = new Version(V_5_1_2_ID, org.apache.lucene.util.Version.LUCENE_6_3_0);
     public static final int V_5_1_3_ID_UNRELEASED = 5010399;
     public static final Version V_5_1_3_UNRELEASED = new Version(V_5_1_3_ID_UNRELEASED, org.apache.lucene.util.Version.LUCENE_6_3_0);
-    public static final int V_5_2_0_ID_UNRELEASED = 5020099;
-    public static final Version V_5_2_0_UNRELEASED = new Version(V_5_2_0_ID_UNRELEASED, org.apache.lucene.util.Version.LUCENE_6_4_0);
-    public static final int V_5_2_1_ID_UNRELEASED = 5020199;
-    public static final Version V_5_2_1_UNRELEASED = new Version(V_5_2_1_ID_UNRELEASED, org.apache.lucene.util.Version.LUCENE_6_4_1);
-    public static final int V_5_2_2_ID_UNRELEASED = 5020299;
-    public static final Version V_5_2_2_UNRELEASED = new Version(V_5_2_2_ID_UNRELEASED, org.apache.lucene.util.Version.LUCENE_6_4_1);
+    public static final int V_5_2_0_ID = 5020099;
+    public static final Version V_5_2_0 = new Version(V_5_2_0_ID, org.apache.lucene.util.Version.LUCENE_6_4_0);
+    public static final int V_5_2_1_ID = 5020199;
+    public static final Version V_5_2_1 = new Version(V_5_2_1_ID, org.apache.lucene.util.Version.LUCENE_6_4_1);
+    public static final int V_5_2_2_ID = 5020299;
+    public static final Version V_5_2_2 = new Version(V_5_2_2_ID, org.apache.lucene.util.Version.LUCENE_6_4_1);
     public static final int V_5_2_3_ID_UNRELEASED = 5020399;
     public static final Version V_5_2_3_UNRELEASED = new Version(V_5_2_3_ID_UNRELEASED, org.apache.lucene.util.Version.LUCENE_6_4_1);
     public static final int V_5_3_0_ID_UNRELEASED = 5030099;
@@ -142,18 +142,18 @@ public class Version implements Comparable<Version> {
                 return V_5_3_0_UNRELEASED;
             case V_5_2_3_ID_UNRELEASED:
                 return V_5_2_3_UNRELEASED;
-            case V_5_2_2_ID_UNRELEASED:
-                return V_5_2_2_UNRELEASED;
-            case V_5_2_1_ID_UNRELEASED:
-                return V_5_2_1_UNRELEASED;
-            case V_5_2_0_ID_UNRELEASED:
-                return V_5_2_0_UNRELEASED;
+            case V_5_2_2_ID:
+                return V_5_2_2;
+            case V_5_2_1_ID:
+                return V_5_2_1;
+            case V_5_2_0_ID:
+                return V_5_2_0;
             case V_5_1_3_ID_UNRELEASED:
                 return V_5_1_3_UNRELEASED;
-            case V_5_1_2_ID_UNRELEASED:
-                return V_5_1_2_UNRELEASED;
-            case V_5_1_1_ID_UNRELEASED:
-                return V_5_1_1_UNRELEASED;
+            case V_5_1_2_ID:
+                return V_5_1_2;
+            case V_5_1_1_ID:
+                return V_5_1_1;
             case V_5_0_3_ID_UNRELEASED:
                 return V_5_0_3_UNRELEASED;
             case V_5_0_2_ID:
diff --git a/core/src/main/java/org/elasticsearch/action/admin/cluster/allocation/ClusterAllocationExplainRequest.java b/core/src/main/java/org/elasticsearch/action/admin/cluster/allocation/ClusterAllocationExplainRequest.java
index d80e58232a5..aea1ee57dca 100644
--- a/core/src/main/java/org/elasticsearch/action/admin/cluster/allocation/ClusterAllocationExplainRequest.java
+++ b/core/src/main/java/org/elasticsearch/action/admin/cluster/allocation/ClusterAllocationExplainRequest.java
@@ -249,8 +249,8 @@ public class ClusterAllocationExplainRequest extends MasterNodeRequest<ClusterAl
     }
 
     private void checkVersion(Version version) {
-        if (version.before(Version.V_5_2_0_UNRELEASED)) {
-            throw new IllegalArgumentException("cannot explain shards in a mixed-cluster with pre-" + Version.V_5_2_0_UNRELEASED +
+        if (version.before(Version.V_5_2_0)) {
+            throw new IllegalArgumentException("cannot explain shards in a mixed-cluster with pre-" + Version.V_5_2_0 +
                                                " nodes, node version [" + version + "]");
         }
     }
diff --git a/core/src/main/java/org/elasticsearch/action/admin/cluster/shards/ClusterSearchShardsRequest.java b/core/src/main/java/org/elasticsearch/action/admin/cluster/shards/ClusterSearchShardsRequest.java
index 36d63bbcebe..df38690b790 100644
--- a/core/src/main/java/org/elasticsearch/action/admin/cluster/shards/ClusterSearchShardsRequest.java
+++ b/core/src/main/java/org/elasticsearch/action/admin/cluster/shards/ClusterSearchShardsRequest.java
@@ -134,7 +134,7 @@ public class ClusterSearchShardsRequest extends MasterNodeReadRequest<ClusterSea
         routing = in.readOptionalString();
         preference = in.readOptionalString();
 
-        if (in.getVersion().onOrBefore(Version.V_5_1_1_UNRELEASED)) {
+        if (in.getVersion().onOrBefore(Version.V_5_1_1)) {
             //types
             in.readStringArray();
         }
@@ -153,7 +153,7 @@ public class ClusterSearchShardsRequest extends MasterNodeReadRequest<ClusterSea
         out.writeOptionalString(routing);
         out.writeOptionalString(preference);
 
-        if (out.getVersion().onOrBefore(Version.V_5_1_1_UNRELEASED)) {
+        if (out.getVersion().onOrBefore(Version.V_5_1_1)) {
             //types
             out.writeStringArray(Strings.EMPTY_ARRAY);
         }
diff --git a/core/src/main/java/org/elasticsearch/action/admin/cluster/shards/ClusterSearchShardsResponse.java b/core/src/main/java/org/elasticsearch/action/admin/cluster/shards/ClusterSearchShardsResponse.java
index 3ee5f56ebdc..c0040a9198f 100644
--- a/core/src/main/java/org/elasticsearch/action/admin/cluster/shards/ClusterSearchShardsResponse.java
+++ b/core/src/main/java/org/elasticsearch/action/admin/cluster/shards/ClusterSearchShardsResponse.java
@@ -72,7 +72,7 @@ public class ClusterSearchShardsResponse extends ActionResponse implements ToXCo
         for (int i = 0; i < nodes.length; i++) {
             nodes[i] = new DiscoveryNode(in);
         }
-        if (in.getVersion().onOrAfter(Version.V_5_1_1_UNRELEASED)) {
+        if (in.getVersion().onOrAfter(Version.V_5_1_1)) {
             int size = in.readVInt();
             indicesAndFilters = new HashMap<>();
             for (int i = 0; i < size; i++) {
@@ -94,7 +94,7 @@ public class ClusterSearchShardsResponse extends ActionResponse implements ToXCo
         for (DiscoveryNode node : nodes) {
             node.writeTo(out);
         }
-        if (out.getVersion().onOrAfter(Version.V_5_1_1_UNRELEASED)) {
+        if (out.getVersion().onOrAfter(Version.V_5_1_1)) {
             out.writeVInt(indicesAndFilters.size());
             for (Map.Entry<String, AliasFilter> entry : indicesAndFilters.entrySet()) {
                 out.writeString(entry.getKey());
diff --git a/core/src/main/java/org/elasticsearch/action/admin/indices/analyze/AnalyzeResponse.java b/core/src/main/java/org/elasticsearch/action/admin/indices/analyze/AnalyzeResponse.java
index e4c6b34d9c7..07e14211a36 100644
--- a/core/src/main/java/org/elasticsearch/action/admin/indices/analyze/AnalyzeResponse.java
+++ b/core/src/main/java/org/elasticsearch/action/admin/indices/analyze/AnalyzeResponse.java
@@ -117,7 +117,7 @@ public class AnalyzeResponse extends ActionResponse implements Iterable<AnalyzeR
             startOffset = in.readInt();
             endOffset = in.readInt();
             position = in.readVInt();
-            if (in.getVersion().onOrAfter(Version.V_5_2_0_UNRELEASED)) {
+            if (in.getVersion().onOrAfter(Version.V_5_2_0)) {
                 Integer len = in.readOptionalVInt();
                 if (len != null) {
                     positionLength = len;
@@ -137,7 +137,7 @@ public class AnalyzeResponse extends ActionResponse implements Iterable<AnalyzeR
             out.writeInt(startOffset);
             out.writeInt(endOffset);
             out.writeVInt(position);
-            if (out.getVersion().onOrAfter(Version.V_5_2_0_UNRELEASED)) {
+            if (out.getVersion().onOrAfter(Version.V_5_2_0)) {
                 out.writeOptionalVInt(positionLength > 1 ? positionLength : null);
             }
             out.writeOptionalString(type);
diff --git a/core/src/main/java/org/elasticsearch/action/bulk/byscroll/AbstractBulkByScrollRequest.java b/core/src/main/java/org/elasticsearch/action/bulk/byscroll/AbstractBulkByScrollRequest.java
index 44580875011..c1ef43a6306 100644
--- a/core/src/main/java/org/elasticsearch/action/bulk/byscroll/AbstractBulkByScrollRequest.java
+++ b/core/src/main/java/org/elasticsearch/action/bulk/byscroll/AbstractBulkByScrollRequest.java
@@ -402,7 +402,7 @@ public abstract class AbstractBulkByScrollRequest<Self extends AbstractBulkByScr
         retryBackoffInitialTime = new TimeValue(in);
         maxRetries = in.readVInt();
         requestsPerSecond = in.readFloat();
-        if (in.getVersion().onOrAfter(Version.V_5_1_1_UNRELEASED)) {
+        if (in.getVersion().onOrAfter(Version.V_5_1_1)) {
             slices = in.readVInt();
         } else {
             slices = 1;
@@ -421,12 +421,12 @@ public abstract class AbstractBulkByScrollRequest<Self extends AbstractBulkByScr
         retryBackoffInitialTime.writeTo(out);
         out.writeVInt(maxRetries);
         out.writeFloat(requestsPerSecond);
-        if (out.getVersion().onOrAfter(Version.V_5_1_1_UNRELEASED)) {
+        if (out.getVersion().onOrAfter(Version.V_5_1_1)) {
             out.writeVInt(slices);
         } else {
             if (slices > 1) {
                 throw new IllegalArgumentException("Attempting to send sliced reindex-style request to a node that doesn't support "
-                        + "it. Version is [" + out.getVersion() + "] but must be [" + Version.V_5_1_1_UNRELEASED + "]");
+                        + "it. Version is [" + out.getVersion() + "] but must be [" + Version.V_5_1_1 + "]");
             }
         }
     }
diff --git a/core/src/main/java/org/elasticsearch/action/bulk/byscroll/BulkByScrollTask.java b/core/src/main/java/org/elasticsearch/action/bulk/byscroll/BulkByScrollTask.java
index 7c9124057b3..58d6c316d36 100644
--- a/core/src/main/java/org/elasticsearch/action/bulk/byscroll/BulkByScrollTask.java
+++ b/core/src/main/java/org/elasticsearch/action/bulk/byscroll/BulkByScrollTask.java
@@ -189,7 +189,7 @@ public abstract class BulkByScrollTask extends CancellableTask {
         }
 
         public Status(StreamInput in) throws IOException {
-            if (in.getVersion().onOrAfter(Version.V_5_1_1_UNRELEASED)) {
+            if (in.getVersion().onOrAfter(Version.V_5_1_1)) {
                 sliceId = in.readOptionalVInt();
             } else {
                 sliceId = null;
@@ -207,7 +207,7 @@ public abstract class BulkByScrollTask extends CancellableTask {
             requestsPerSecond = in.readFloat();
             reasonCancelled = in.readOptionalString();
             throttledUntil = new TimeValue(in);
-            if (in.getVersion().onOrAfter(Version.V_5_1_1_UNRELEASED)) {
+            if (in.getVersion().onOrAfter(Version.V_5_1_1)) {
                 sliceStatuses = in.readList(stream -> stream.readOptionalWriteable(StatusOrException::new));
             } else {
                 sliceStatuses = emptyList();
@@ -216,7 +216,7 @@ public abstract class BulkByScrollTask extends CancellableTask {
 
         @Override
         public void writeTo(StreamOutput out) throws IOException {
-            if (out.getVersion().onOrAfter(Version.V_5_1_1_UNRELEASED)) {
+            if (out.getVersion().onOrAfter(Version.V_5_1_1)) {
                 out.writeOptionalVInt(sliceId);
             }
             out.writeVLong(total);
@@ -232,7 +232,7 @@ public abstract class BulkByScrollTask extends CancellableTask {
             out.writeFloat(requestsPerSecond);
             out.writeOptionalString(reasonCancelled);
             throttledUntil.writeTo(out);
-            if (out.getVersion().onOrAfter(Version.V_5_1_1_UNRELEASED)) {
+            if (out.getVersion().onOrAfter(Version.V_5_1_1)) {
                 out.writeVInt(sliceStatuses.size());
                 for (StatusOrException sliceStatus : sliceStatuses) {
                     out.writeOptionalWriteable(sliceStatus);
diff --git a/core/src/main/java/org/elasticsearch/action/fieldstats/FieldStats.java b/core/src/main/java/org/elasticsearch/action/fieldstats/FieldStats.java
index 5f85b95c7fe..44b330dc37c 100644
--- a/core/src/main/java/org/elasticsearch/action/fieldstats/FieldStats.java
+++ b/core/src/main/java/org/elasticsearch/action/fieldstats/FieldStats.java
@@ -323,14 +323,14 @@ public abstract class FieldStats<T> implements Writeable, ToXContent {
         out.writeLong(sumTotalTermFreq);
         out.writeBoolean(isSearchable);
         out.writeBoolean(isAggregatable);
-        if (out.getVersion().onOrAfter(Version.V_5_2_0_UNRELEASED)) {
+        if (out.getVersion().onOrAfter(Version.V_5_2_0)) {
             out.writeBoolean(hasMinMax);
             if (hasMinMax) {
                 writeMinMax(out);
             }
         } else {
             assert hasMinMax : "cannot serialize null min/max fieldstats in a mixed-cluster " +
-                    "with pre-" + Version.V_5_2_0_UNRELEASED + " nodes, remote version [" + out.getVersion() + "]";
+                    "with pre-" + Version.V_5_2_0 + " nodes, remote version [" + out.getVersion() + "]";
             writeMinMax(out);
         }
     }
@@ -705,7 +705,7 @@ public abstract class FieldStats<T> implements Writeable, ToXContent {
         boolean isSearchable = in.readBoolean();
         boolean isAggregatable = in.readBoolean();
         boolean hasMinMax = true;
-        if (in.getVersion().onOrAfter(Version.V_5_2_0_UNRELEASED)) {
+        if (in.getVersion().onOrAfter(Version.V_5_2_0)) {
             hasMinMax = in.readBoolean();
         }
         switch (type) {
diff --git a/core/src/main/java/org/elasticsearch/action/fieldstats/FieldStatsResponse.java b/core/src/main/java/org/elasticsearch/action/fieldstats/FieldStatsResponse.java
index f126c73d04d..2046aeddc1b 100644
--- a/core/src/main/java/org/elasticsearch/action/fieldstats/FieldStatsResponse.java
+++ b/core/src/main/java/org/elasticsearch/action/fieldstats/FieldStatsResponse.java
@@ -93,7 +93,7 @@ public class FieldStatsResponse extends BroadcastResponse {
         for (Map.Entry<String, Map<String, FieldStats>> entry1 : indicesMergedFieldStats.entrySet()) {
             out.writeString(entry1.getKey());
             int size = entry1.getValue().size();
-            if (out.getVersion().before(Version.V_5_2_0_UNRELEASED)) {
+            if (out.getVersion().before(Version.V_5_2_0)) {
                 // filter fieldstats without min/max information
                 for (FieldStats stats : entry1.getValue().values()) {
                     if (stats.hasMinMax() == false) {
@@ -103,7 +103,7 @@ public class FieldStatsResponse extends BroadcastResponse {
             }
             out.writeVInt(size);
             for (Map.Entry<String, FieldStats> entry2 : entry1.getValue().entrySet()) {
-                if (entry2.getValue().hasMinMax() || out.getVersion().onOrAfter(Version.V_5_2_0_UNRELEASED)) {
+                if (entry2.getValue().hasMinMax() || out.getVersion().onOrAfter(Version.V_5_2_0)) {
                     out.writeString(entry2.getKey());
                     entry2.getValue().writeTo(out);
                 }
diff --git a/core/src/main/java/org/elasticsearch/action/fieldstats/FieldStatsShardResponse.java b/core/src/main/java/org/elasticsearch/action/fieldstats/FieldStatsShardResponse.java
index 133a94e69a4..d2f3a7d5e45 100644
--- a/core/src/main/java/org/elasticsearch/action/fieldstats/FieldStatsShardResponse.java
+++ b/core/src/main/java/org/elasticsearch/action/fieldstats/FieldStatsShardResponse.java
@@ -68,7 +68,7 @@ public class FieldStatsShardResponse extends BroadcastShardResponse {
     public void writeTo(StreamOutput out) throws IOException {
         super.writeTo(out);
         final Map<String, FieldStats<?> > stats;
-        if (out.getVersion().before(Version.V_5_2_0_UNRELEASED)) {
+        if (out.getVersion().before(Version.V_5_2_0)) {
             /**
              * FieldStats with null min/max are not (de)serializable in versions prior to {@link Version.V_5_2_0_UNRELEASED}
              */
diff --git a/core/src/main/java/org/elasticsearch/action/index/IndexRequest.java b/core/src/main/java/org/elasticsearch/action/index/IndexRequest.java
index ca9e41c8e8a..74732d2fcb9 100644
--- a/core/src/main/java/org/elasticsearch/action/index/IndexRequest.java
+++ b/core/src/main/java/org/elasticsearch/action/index/IndexRequest.java
@@ -554,7 +554,7 @@ public class IndexRequest extends ReplicatedWriteRequest<IndexRequest> implement
         out.writeBytesReference(source);
         out.writeByte(opType.getId());
         // ES versions below 5.1.2 don't know about resolveVersionDefaults but resolve the version eagerly (which messes with validation).
-        if (out.getVersion().before(Version.V_5_1_2_UNRELEASED)) {
+        if (out.getVersion().before(Version.V_5_1_2)) {
             out.writeLong(resolveVersionDefaults());
         } else {
             out.writeLong(version);
diff --git a/core/src/main/java/org/elasticsearch/cluster/SnapshotDeletionsInProgress.java b/core/src/main/java/org/elasticsearch/cluster/SnapshotDeletionsInProgress.java
index b3ab12fe21a..9641c95a827 100644
--- a/core/src/main/java/org/elasticsearch/cluster/SnapshotDeletionsInProgress.java
+++ b/core/src/main/java/org/elasticsearch/cluster/SnapshotDeletionsInProgress.java
@@ -40,7 +40,7 @@ public class SnapshotDeletionsInProgress extends AbstractNamedDiffable<Custom> i
 
     public static final String TYPE = "snapshot_deletions";
     // the version where SnapshotDeletionsInProgress was introduced
-    public static final Version VERSION_INTRODUCED = Version.V_5_2_0_UNRELEASED;
+    public static final Version VERSION_INTRODUCED = Version.V_5_2_0;
 
     // the list of snapshot deletion request entries
     private final List<Entry> entries;
diff --git a/core/src/main/java/org/elasticsearch/cluster/SnapshotsInProgress.java b/core/src/main/java/org/elasticsearch/cluster/SnapshotsInProgress.java
index 0ac1e8e4090..1f36a9efe45 100644
--- a/core/src/main/java/org/elasticsearch/cluster/SnapshotsInProgress.java
+++ b/core/src/main/java/org/elasticsearch/cluster/SnapshotsInProgress.java
@@ -51,7 +51,7 @@ public class SnapshotsInProgress extends AbstractNamedDiffable<Custom> implement
     // a snapshot in progress from a pre 5.2.x node
     public static final long UNDEFINED_REPOSITORY_STATE_ID = -2L;
     // the version where repository state ids were introduced
-    private static final Version REPOSITORY_ID_INTRODUCED_VERSION = Version.V_5_2_0_UNRELEASED;
+    private static final Version REPOSITORY_ID_INTRODUCED_VERSION = Version.V_5_2_0;
 
     @Override
     public boolean equals(Object o) {
diff --git a/core/src/main/java/org/elasticsearch/cluster/routing/allocation/NodeAllocationResult.java b/core/src/main/java/org/elasticsearch/cluster/routing/allocation/NodeAllocationResult.java
index 3740ded3060..0d3fe2df920 100644
--- a/core/src/main/java/org/elasticsearch/cluster/routing/allocation/NodeAllocationResult.java
+++ b/core/src/main/java/org/elasticsearch/cluster/routing/allocation/NodeAllocationResult.java
@@ -80,7 +80,7 @@ public class NodeAllocationResult implements ToXContent, Writeable, Comparable<N
     public NodeAllocationResult(StreamInput in) throws IOException {
         node = new DiscoveryNode(in);
         shardStoreInfo = in.readOptionalWriteable(ShardStoreInfo::new);
-        if (in.getVersion().before(Version.V_5_2_1_UNRELEASED)) {
+        if (in.getVersion().before(Version.V_5_2_1)) {
             canAllocateDecision = Decision.readFrom(in);
         } else {
             canAllocateDecision = in.readOptionalWriteable(Decision::readFrom);
@@ -93,7 +93,7 @@ public class NodeAllocationResult implements ToXContent, Writeable, Comparable<N
     public void writeTo(StreamOutput out) throws IOException {
         node.writeTo(out);
         out.writeOptionalWriteable(shardStoreInfo);
-        if (out.getVersion().before(Version.V_5_2_1_UNRELEASED)) {
+        if (out.getVersion().before(Version.V_5_2_1)) {
             if (canAllocateDecision == null) {
                 Decision.NO.writeTo(out);
             } else {
diff --git a/core/src/main/java/org/elasticsearch/index/query/InnerHitBuilder.java b/core/src/main/java/org/elasticsearch/index/query/InnerHitBuilder.java
index c1b240066ab..a7203000176 100644
--- a/core/src/main/java/org/elasticsearch/index/query/InnerHitBuilder.java
+++ b/core/src/main/java/org/elasticsearch/index/query/InnerHitBuilder.java
@@ -212,7 +212,7 @@ public final class InnerHitBuilder extends ToXContentToBytes implements Writeabl
         name = in.readOptionalString();
         nestedPath = in.readOptionalString();
         parentChildType = in.readOptionalString();
-        if (in.getVersion().onOrAfter(Version.V_5_2_0_UNRELEASED)) {
+        if (in.getVersion().onOrAfter(Version.V_5_2_0)) {
             ignoreUnmapped = in.readBoolean();
         }
         from = in.readVInt();
@@ -253,7 +253,7 @@ public final class InnerHitBuilder extends ToXContentToBytes implements Writeabl
         out.writeOptionalString(name);
         out.writeOptionalString(nestedPath);
         out.writeOptionalString(parentChildType);
-        if (out.getVersion().onOrAfter(Version.V_5_2_0_UNRELEASED)) {
+        if (out.getVersion().onOrAfter(Version.V_5_2_0)) {
             out.writeBoolean(ignoreUnmapped);
         }
         out.writeVInt(from);
diff --git a/core/src/main/java/org/elasticsearch/index/query/QueryStringQueryBuilder.java b/core/src/main/java/org/elasticsearch/index/query/QueryStringQueryBuilder.java
index ca716372571..19604bb293b 100644
--- a/core/src/main/java/org/elasticsearch/index/query/QueryStringQueryBuilder.java
+++ b/core/src/main/java/org/elasticsearch/index/query/QueryStringQueryBuilder.java
@@ -212,11 +212,11 @@ public class QueryStringQueryBuilder extends AbstractQueryBuilder<QueryStringQue
         autoGeneratePhraseQueries = in.readBoolean();
         allowLeadingWildcard = in.readOptionalBoolean();
         analyzeWildcard = in.readOptionalBoolean();
-        if (in.getVersion().before(Version.V_5_1_1_UNRELEASED)) {
+        if (in.getVersion().before(Version.V_5_1_1)) {
             in.readBoolean(); // lowercase_expanded_terms
         }
         enablePositionIncrements = in.readBoolean();
-        if (in.getVersion().before(Version.V_5_1_1_UNRELEASED)) {
+        if (in.getVersion().before(Version.V_5_1_1)) {
             in.readString(); // locale
         }
         fuzziness = new Fuzziness(in);
@@ -232,7 +232,7 @@ public class QueryStringQueryBuilder extends AbstractQueryBuilder<QueryStringQue
         timeZone = in.readOptionalTimeZone();
         escape = in.readBoolean();
         maxDeterminizedStates = in.readVInt();
-        if (in.getVersion().onOrAfter(Version.V_5_1_1_UNRELEASED)) {
+        if (in.getVersion().onOrAfter(Version.V_5_1_1)) {
             splitOnWhitespace = in.readBoolean();
             useAllFields = in.readOptionalBoolean();
         } else {
@@ -256,11 +256,11 @@ public class QueryStringQueryBuilder extends AbstractQueryBuilder<QueryStringQue
         out.writeBoolean(this.autoGeneratePhraseQueries);
         out.writeOptionalBoolean(this.allowLeadingWildcard);
         out.writeOptionalBoolean(this.analyzeWildcard);
-        if (out.getVersion().before(Version.V_5_1_1_UNRELEASED)) {
+        if (out.getVersion().before(Version.V_5_1_1)) {
             out.writeBoolean(true); // lowercase_expanded_terms
         }
         out.writeBoolean(this.enablePositionIncrements);
-        if (out.getVersion().before(Version.V_5_1_1_UNRELEASED)) {
+        if (out.getVersion().before(Version.V_5_1_1)) {
             out.writeString(Locale.ROOT.toLanguageTag()); // locale
         }
         this.fuzziness.writeTo(out);
@@ -276,7 +276,7 @@ public class QueryStringQueryBuilder extends AbstractQueryBuilder<QueryStringQue
         out.writeOptionalTimeZone(timeZone);
         out.writeBoolean(this.escape);
         out.writeVInt(this.maxDeterminizedStates);
-        if (out.getVersion().onOrAfter(Version.V_5_1_1_UNRELEASED)) {
+        if (out.getVersion().onOrAfter(Version.V_5_1_1)) {
             out.writeBoolean(this.splitOnWhitespace);
             out.writeOptionalBoolean(this.useAllFields);
         }
diff --git a/core/src/main/java/org/elasticsearch/index/query/RangeQueryBuilder.java b/core/src/main/java/org/elasticsearch/index/query/RangeQueryBuilder.java
index bc1bd4bea93..22c17e4ddba 100644
--- a/core/src/main/java/org/elasticsearch/index/query/RangeQueryBuilder.java
+++ b/core/src/main/java/org/elasticsearch/index/query/RangeQueryBuilder.java
@@ -112,7 +112,7 @@ public class RangeQueryBuilder extends AbstractQueryBuilder<RangeQueryBuilder> i
         if (formatString != null) {
             format = Joda.forPattern(formatString);
         }
-        if (in.getVersion().onOrAfter(Version.V_5_2_0_UNRELEASED)) {
+        if (in.getVersion().onOrAfter(Version.V_5_2_0)) {
             String relationString = in.readOptionalString();
             if (relationString != null) {
                 relation = ShapeRelation.getRelationByName(relationString);
@@ -133,7 +133,7 @@ public class RangeQueryBuilder extends AbstractQueryBuilder<RangeQueryBuilder> i
             formatString = this.format.format();
         }
         out.writeOptionalString(formatString);
-        if (out.getVersion().onOrAfter(Version.V_5_2_0_UNRELEASED)) {
+        if (out.getVersion().onOrAfter(Version.V_5_2_0)) {
             String relationString = null;
             if (this.relation != null) {
                 relationString = this.relation.getRelationName();
diff --git a/core/src/main/java/org/elasticsearch/index/query/SimpleQueryStringBuilder.java b/core/src/main/java/org/elasticsearch/index/query/SimpleQueryStringBuilder.java
index 8312d56c3f1..2efa4e815a4 100644
--- a/core/src/main/java/org/elasticsearch/index/query/SimpleQueryStringBuilder.java
+++ b/core/src/main/java/org/elasticsearch/index/query/SimpleQueryStringBuilder.java
@@ -157,19 +157,19 @@ public class SimpleQueryStringBuilder extends AbstractQueryBuilder<SimpleQuerySt
         flags = in.readInt();
         analyzer = in.readOptionalString();
         defaultOperator = Operator.readFromStream(in);
-        if (in.getVersion().before(Version.V_5_1_1_UNRELEASED)) {
+        if (in.getVersion().before(Version.V_5_1_1)) {
             in.readBoolean(); // lowercase_expanded_terms
         }
         settings.lenient(in.readBoolean());
-        if (in.getVersion().onOrAfter(Version.V_5_1_1_UNRELEASED)) {
+        if (in.getVersion().onOrAfter(Version.V_5_1_1)) {
             this.lenientSet = in.readBoolean();
         }
         settings.analyzeWildcard(in.readBoolean());
-        if (in.getVersion().before(Version.V_5_1_1_UNRELEASED)) {
+        if (in.getVersion().before(Version.V_5_1_1)) {
             in.readString(); // locale
         }
         minimumShouldMatch = in.readOptionalString();
-        if (in.getVersion().onOrAfter(Version.V_5_1_1_UNRELEASED)) {
+        if (in.getVersion().onOrAfter(Version.V_5_1_1)) {
             settings.quoteFieldSuffix(in.readOptionalString());
             useAllFields = in.readOptionalBoolean();
         }
@@ -186,19 +186,19 @@ public class SimpleQueryStringBuilder extends AbstractQueryBuilder<SimpleQuerySt
         out.writeInt(flags);
         out.writeOptionalString(analyzer);
         defaultOperator.writeTo(out);
-        if (out.getVersion().before(Version.V_5_1_1_UNRELEASED)) {
+        if (out.getVersion().before(Version.V_5_1_1)) {
             out.writeBoolean(true); // lowercase_expanded_terms
         }
         out.writeBoolean(settings.lenient());
-        if (out.getVersion().onOrAfter(Version.V_5_1_1_UNRELEASED)) {
+        if (out.getVersion().onOrAfter(Version.V_5_1_1)) {
             out.writeBoolean(lenientSet);
         }
         out.writeBoolean(settings.analyzeWildcard());
-        if (out.getVersion().before(Version.V_5_1_1_UNRELEASED)) {
+        if (out.getVersion().before(Version.V_5_1_1)) {
             out.writeString(Locale.ROOT.toLanguageTag()); // locale
         }
         out.writeOptionalString(minimumShouldMatch);
-        if (out.getVersion().onOrAfter(Version.V_5_1_1_UNRELEASED)) {
+        if (out.getVersion().onOrAfter(Version.V_5_1_1)) {
             out.writeOptionalString(settings.quoteFieldSuffix());
             out.writeOptionalBoolean(useAllFields);
         }
diff --git a/core/src/main/java/org/elasticsearch/index/refresh/RefreshStats.java b/core/src/main/java/org/elasticsearch/index/refresh/RefreshStats.java
index 8fc16ae1b1d..a8a8a0be41c 100644
--- a/core/src/main/java/org/elasticsearch/index/refresh/RefreshStats.java
+++ b/core/src/main/java/org/elasticsearch/index/refresh/RefreshStats.java
@@ -106,7 +106,7 @@ public class RefreshStats implements Streamable, ToXContent {
     public void readFrom(StreamInput in) throws IOException {
         total = in.readVLong();
         totalTimeInMillis = in.readVLong();
-        if (in.getVersion().onOrAfter(Version.V_5_2_0_UNRELEASED)) {
+        if (in.getVersion().onOrAfter(Version.V_5_2_0)) {
             listeners = in.readVInt();
         } else {
             listeners = 0;
@@ -117,7 +117,7 @@ public class RefreshStats implements Streamable, ToXContent {
     public void writeTo(StreamOutput out) throws IOException {
         out.writeVLong(total);
         out.writeVLong(totalTimeInMillis);
-        if (out.getVersion().onOrAfter(Version.V_5_2_0_UNRELEASED)) {
+        if (out.getVersion().onOrAfter(Version.V_5_2_0)) {
             out.writeVInt(listeners);
         }
     }
diff --git a/core/src/main/java/org/elasticsearch/monitor/os/OsStats.java b/core/src/main/java/org/elasticsearch/monitor/os/OsStats.java
index d01b1f9b432..c3783c600ea 100644
--- a/core/src/main/java/org/elasticsearch/monitor/os/OsStats.java
+++ b/core/src/main/java/org/elasticsearch/monitor/os/OsStats.java
@@ -52,7 +52,7 @@ public class OsStats implements Writeable, ToXContent {
         this.cpu = new Cpu(in);
         this.mem = new Mem(in);
         this.swap = new Swap(in);
-        if (in.getVersion().onOrAfter(Version.V_5_1_1_UNRELEASED)) {
+        if (in.getVersion().onOrAfter(Version.V_5_1_1)) {
             this.cgroup = in.readOptionalWriteable(Cgroup::new);
         } else {
             this.cgroup = null;
@@ -65,7 +65,7 @@ public class OsStats implements Writeable, ToXContent {
         cpu.writeTo(out);
         mem.writeTo(out);
         swap.writeTo(out);
-        if (out.getVersion().onOrAfter(Version.V_5_1_1_UNRELEASED)) {
+        if (out.getVersion().onOrAfter(Version.V_5_1_1)) {
             out.writeOptionalWriteable(cgroup);
         }
     }
diff --git a/core/src/main/java/org/elasticsearch/script/Script.java b/core/src/main/java/org/elasticsearch/script/Script.java
index 9f8a774398c..f103104ec65 100644
--- a/core/src/main/java/org/elasticsearch/script/Script.java
+++ b/core/src/main/java/org/elasticsearch/script/Script.java
@@ -496,7 +496,7 @@ public final class Script implements ToXContentObject, Writeable {
         // Version 5.1 to 5.3 (exclusive) requires all Script members to be non-null and supports the potential
         // for more options than just XContentType.  Reorders the read in contents to be in
         // same order as the constructor.
-        } else if (in.getVersion().onOrAfter(Version.V_5_1_1_UNRELEASED)) {
+        } else if (in.getVersion().onOrAfter(Version.V_5_1_1)) {
             this.type = ScriptType.readFrom(in);
             this.lang = in.readString();
 
@@ -565,7 +565,7 @@ public final class Script implements ToXContentObject, Writeable {
         // Version 5.1 to 5.3 (exclusive) requires all Script members to be non-null and supports the potential
         // for more options than just XContentType.  Reorders the written out contents to be in
         // same order as the constructor.
-        } else if (out.getVersion().onOrAfter(Version.V_5_1_1_UNRELEASED)) {
+        } else if (out.getVersion().onOrAfter(Version.V_5_1_1)) {
             type.writeTo(out);
 
             if (lang == null) {
diff --git a/core/src/main/java/org/elasticsearch/search/aggregations/bucket/terms/support/IncludeExclude.java b/core/src/main/java/org/elasticsearch/search/aggregations/bucket/terms/support/IncludeExclude.java
index 5925cc2e4ad..ebef200059c 100644
--- a/core/src/main/java/org/elasticsearch/search/aggregations/bucket/terms/support/IncludeExclude.java
+++ b/core/src/main/java/org/elasticsearch/search/aggregations/bucket/terms/support/IncludeExclude.java
@@ -430,7 +430,7 @@ public class IncludeExclude implements Writeable, ToXContent {
         } else {
             excludeValues = null;
         }
-        if (in.getVersion().onOrAfter(Version.V_5_2_0_UNRELEASED)) {
+        if (in.getVersion().onOrAfter(Version.V_5_2_0)) {
             incNumPartitions = in.readVInt();
             incZeroBasedPartition = in.readVInt();
         } else {
@@ -463,7 +463,7 @@ public class IncludeExclude implements Writeable, ToXContent {
                     out.writeBytesRef(value);
                 }
             }
-            if (out.getVersion().onOrAfter(Version.V_5_2_0_UNRELEASED)) {
+            if (out.getVersion().onOrAfter(Version.V_5_2_0)) {
                 out.writeVInt(incNumPartitions);
                 out.writeVInt(incZeroBasedPartition);
             }
diff --git a/core/src/main/java/org/elasticsearch/search/internal/AliasFilter.java b/core/src/main/java/org/elasticsearch/search/internal/AliasFilter.java
index 915e745ddf4..2142f210eba 100644
--- a/core/src/main/java/org/elasticsearch/search/internal/AliasFilter.java
+++ b/core/src/main/java/org/elasticsearch/search/internal/AliasFilter.java
@@ -52,7 +52,7 @@ public final class AliasFilter implements Writeable {
 
     public AliasFilter(StreamInput input) throws IOException {
         aliases = input.readStringArray();
-        if (input.getVersion().onOrAfter(Version.V_5_1_1_UNRELEASED)) {
+        if (input.getVersion().onOrAfter(Version.V_5_1_1)) {
             filter = input.readOptionalNamedWriteable(QueryBuilder.class);
             reparseAliases = false;
         } else {
@@ -88,7 +88,7 @@ public final class AliasFilter implements Writeable {
     @Override
     public void writeTo(StreamOutput out) throws IOException {
         out.writeStringArray(aliases);
-        if (out.getVersion().onOrAfter(Version.V_5_1_1_UNRELEASED)) {
+        if (out.getVersion().onOrAfter(Version.V_5_1_1)) {
             out.writeOptionalNamedWriteable(filter);
         }
     }
diff --git a/core/src/main/java/org/elasticsearch/search/internal/ShardSearchLocalRequest.java b/core/src/main/java/org/elasticsearch/search/internal/ShardSearchLocalRequest.java
index 1f3868c0dba..52d96c1bdad 100644
--- a/core/src/main/java/org/elasticsearch/search/internal/ShardSearchLocalRequest.java
+++ b/core/src/main/java/org/elasticsearch/search/internal/ShardSearchLocalRequest.java
@@ -177,7 +177,7 @@ public class ShardSearchLocalRequest implements ShardSearchRequest {
         source = in.readOptionalWriteable(SearchSourceBuilder::new);
         types = in.readStringArray();
         aliasFilter = new AliasFilter(in);
-        if (in.getVersion().onOrAfter(Version.V_5_2_0_UNRELEASED)) {
+        if (in.getVersion().onOrAfter(Version.V_5_2_0)) {
             indexBoost = in.readFloat();
         } else {
             // Nodes < 5.2.0 doesn't send index boost. Read it from source.
@@ -205,7 +205,7 @@ public class ShardSearchLocalRequest implements ShardSearchRequest {
         out.writeOptionalWriteable(source);
         out.writeStringArray(types);
         aliasFilter.writeTo(out);
-        if (out.getVersion().onOrAfter(Version.V_5_2_0_UNRELEASED)) {
+        if (out.getVersion().onOrAfter(Version.V_5_2_0)) {
             out.writeFloat(indexBoost);
         }
         if (!asKey) {
diff --git a/core/src/main/java/org/elasticsearch/snapshots/SnapshotInfo.java b/core/src/main/java/org/elasticsearch/snapshots/SnapshotInfo.java
index 519393d49e1..558447eab9f 100644
--- a/core/src/main/java/org/elasticsearch/snapshots/SnapshotInfo.java
+++ b/core/src/main/java/org/elasticsearch/snapshots/SnapshotInfo.java
@@ -68,7 +68,7 @@ public final class SnapshotInfo implements Comparable<SnapshotInfo>, ToXContent,
     private static final String TOTAL_SHARDS = "total_shards";
     private static final String SUCCESSFUL_SHARDS = "successful_shards";
 
-    private static final Version VERSION_INCOMPATIBLE_INTRODUCED = Version.V_5_2_0_UNRELEASED;
+    private static final Version VERSION_INCOMPATIBLE_INTRODUCED = Version.V_5_2_0;
 
     private final SnapshotId snapshotId;
 
diff --git a/core/src/test/java/org/elasticsearch/ExceptionSerializationTests.java b/core/src/test/java/org/elasticsearch/ExceptionSerializationTests.java
index 2cd87c0470e..c38ba029e98 100644
--- a/core/src/test/java/org/elasticsearch/ExceptionSerializationTests.java
+++ b/core/src/test/java/org/elasticsearch/ExceptionSerializationTests.java
@@ -970,7 +970,7 @@ public class ExceptionSerializationTests extends ESTestCase {
         try (StreamInput in = decoded.streamInput()) {
             //randomize the version across released and unreleased ones
             Version version = randomFrom(Version.V_5_0_0, Version.V_5_0_1, Version.V_5_0_2,
-                    Version.V_5_0_3_UNRELEASED, Version.V_5_1_1_UNRELEASED, Version.V_5_1_2_UNRELEASED, Version.V_5_2_0_UNRELEASED);
+                    Version.V_5_0_3_UNRELEASED, Version.V_5_1_1, Version.V_5_1_2, Version.V_5_2_0);
             in.setVersion(version);
             ElasticsearchException exception = new ElasticsearchException(in);
             assertEquals("test  message", exception.getMessage());
diff --git a/core/src/test/java/org/elasticsearch/VersionTests.java b/core/src/test/java/org/elasticsearch/VersionTests.java
index 35c36bee643..ae78d2c1983 100644
--- a/core/src/test/java/org/elasticsearch/VersionTests.java
+++ b/core/src/test/java/org/elasticsearch/VersionTests.java
@@ -41,7 +41,6 @@ import static org.hamcrest.Matchers.containsString;
 import static org.hamcrest.Matchers.greaterThan;
 import static org.hamcrest.Matchers.is;
 import static org.hamcrest.Matchers.lessThan;
-import static org.hamcrest.Matchers.lessThanOrEqualTo;
 import static org.hamcrest.Matchers.sameInstance;
 
 public class VersionTests extends ESTestCase {
@@ -100,7 +99,7 @@ public class VersionTests extends ESTestCase {
     public void testMinimumIndexCompatibilityVersion() {
         assertEquals(Version.V_5_0_0, Version.V_6_0_0_alpha1_UNRELEASED.minimumIndexCompatibilityVersion());
         assertEquals(Version.V_2_0_0, Version.V_5_0_0.minimumIndexCompatibilityVersion());
-        assertEquals(Version.V_2_0_0, Version.V_5_1_1_UNRELEASED.minimumIndexCompatibilityVersion());
+        assertEquals(Version.V_2_0_0, Version.V_5_1_1.minimumIndexCompatibilityVersion());
         assertEquals(Version.V_2_0_0, Version.V_5_0_0_alpha1.minimumIndexCompatibilityVersion());
     }
 
diff --git a/core/src/test/java/org/elasticsearch/action/admin/cluster/shards/ClusterSearchShardsResponseTests.java b/core/src/test/java/org/elasticsearch/action/admin/cluster/shards/ClusterSearchShardsResponseTests.java
index 9c5b1ae8944..41ed1b27302 100644
--- a/core/src/test/java/org/elasticsearch/action/admin/cluster/shards/ClusterSearchShardsResponseTests.java
+++ b/core/src/test/java/org/elasticsearch/action/admin/cluster/shards/ClusterSearchShardsResponseTests.java
@@ -93,7 +93,7 @@ public class ClusterSearchShardsResponseTests extends ESTestCase {
                     assertEquals(clusterSearchShardsGroup.getShardId(), deserializedGroup.getShardId());
                     assertArrayEquals(clusterSearchShardsGroup.getShards(), deserializedGroup.getShards());
                 }
-                if (version.onOrAfter(Version.V_5_1_1_UNRELEASED)) {
+                if (version.onOrAfter(Version.V_5_1_1)) {
                     assertEquals(clusterSearchShardsResponse.getIndicesAndFilters(), deserialized.getIndicesAndFilters());
                 } else {
                     assertNull(deserialized.getIndicesAndFilters());
diff --git a/core/src/test/java/org/elasticsearch/action/admin/cluster/storedscripts/PutStoredScriptRequestTests.java b/core/src/test/java/org/elasticsearch/action/admin/cluster/storedscripts/PutStoredScriptRequestTests.java
index 5f3e1079421..a71d979efb0 100644
--- a/core/src/test/java/org/elasticsearch/action/admin/cluster/storedscripts/PutStoredScriptRequestTests.java
+++ b/core/src/test/java/org/elasticsearch/action/admin/cluster/storedscripts/PutStoredScriptRequestTests.java
@@ -51,7 +51,7 @@ public class PutStoredScriptRequestTests extends ESTestCase {
     public void testSerializationBwc() throws IOException {
         final byte[] rawStreamBytes = Base64.getDecoder().decode("ADwDCG11c3RhY2hlAQZzY3JpcHQCe30A");
         final Version version = randomFrom(Version.V_5_0_0, Version.V_5_0_1, Version.V_5_0_2,
-            Version.V_5_0_3_UNRELEASED, Version.V_5_1_1_UNRELEASED, Version.V_5_1_2_UNRELEASED, Version.V_5_2_0_UNRELEASED);
+            Version.V_5_0_3_UNRELEASED, Version.V_5_1_1, Version.V_5_1_2, Version.V_5_2_0);
         try (StreamInput in = StreamInput.wrap(rawStreamBytes)) {
             in.setVersion(version);
             PutStoredScriptRequest serialized = new PutStoredScriptRequest();
diff --git a/core/src/test/java/org/elasticsearch/action/admin/indices/create/CreateIndexRequestTests.java b/core/src/test/java/org/elasticsearch/action/admin/indices/create/CreateIndexRequestTests.java
index 590eba36666..ac8ecb8d10d 100644
--- a/core/src/test/java/org/elasticsearch/action/admin/indices/create/CreateIndexRequestTests.java
+++ b/core/src/test/java/org/elasticsearch/action/admin/indices/create/CreateIndexRequestTests.java
@@ -52,7 +52,7 @@ public class CreateIndexRequestTests extends ESTestCase {
     public void testSerializationBwc() throws IOException {
         final byte[] data = Base64.getDecoder().decode("ADwDAANmb28APAMBB215X3R5cGULeyJ0eXBlIjp7fX0AAAD////+AA==");
         final Version version = randomFrom(Version.V_5_0_0, Version.V_5_0_1, Version.V_5_0_2,
-            Version.V_5_0_3_UNRELEASED, Version.V_5_1_1_UNRELEASED, Version.V_5_1_2_UNRELEASED, Version.V_5_2_0_UNRELEASED);
+            Version.V_5_0_3_UNRELEASED, Version.V_5_1_1, Version.V_5_1_2, Version.V_5_2_0);
         try (StreamInput in = StreamInput.wrap(data)) {
             in.setVersion(version);
             CreateIndexRequest serialized = new CreateIndexRequest();
diff --git a/core/src/test/java/org/elasticsearch/action/admin/indices/mapping/put/PutMappingRequestTests.java b/core/src/test/java/org/elasticsearch/action/admin/indices/mapping/put/PutMappingRequestTests.java
index fd7f830e592..5a002dc70b4 100644
--- a/core/src/test/java/org/elasticsearch/action/admin/indices/mapping/put/PutMappingRequestTests.java
+++ b/core/src/test/java/org/elasticsearch/action/admin/indices/mapping/put/PutMappingRequestTests.java
@@ -94,7 +94,7 @@ public class PutMappingRequestTests extends ESTestCase {
     public void testSerializationBwc() throws IOException {
         final byte[] data = Base64.getDecoder().decode("ADwDAQNmb28MAA8tLS0KZm9vOiAiYmFyIgoAPAMAAAA=");
         final Version version = randomFrom(Version.V_5_0_0, Version.V_5_0_1, Version.V_5_0_2,
-            Version.V_5_0_3_UNRELEASED, Version.V_5_1_1_UNRELEASED, Version.V_5_1_2_UNRELEASED, Version.V_5_2_0_UNRELEASED);
+            Version.V_5_0_3_UNRELEASED, Version.V_5_1_1, Version.V_5_1_2, Version.V_5_2_0);
         try (StreamInput in = StreamInput.wrap(data)) {
             in.setVersion(version);
             PutMappingRequest request = new PutMappingRequest();
diff --git a/core/src/test/java/org/elasticsearch/action/admin/indices/template/put/PutIndexTemplateRequestTests.java b/core/src/test/java/org/elasticsearch/action/admin/indices/template/put/PutIndexTemplateRequestTests.java
index 48b2ae79cf3..215e158e4b7 100644
--- a/core/src/test/java/org/elasticsearch/action/admin/indices/template/put/PutIndexTemplateRequestTests.java
+++ b/core/src/test/java/org/elasticsearch/action/admin/indices/template/put/PutIndexTemplateRequestTests.java
@@ -89,7 +89,7 @@ public class PutIndexTemplateRequestTests extends ESTestCase {
     public void testPutIndexTemplateRequestSerializationXContentBwc() throws IOException {
         final byte[] data = Base64.getDecoder().decode("ADwDAANmb28IdGVtcGxhdGUAAAAAAAABA2Jhcg8tLS0KZm9vOiAiYmFyIgoAAAAAAAAAAAAAAAA=");
         final Version version = randomFrom(Version.V_5_0_0, Version.V_5_0_1, Version.V_5_0_2,
-            Version.V_5_0_3_UNRELEASED, Version.V_5_1_1_UNRELEASED, Version.V_5_1_2_UNRELEASED, Version.V_5_2_0_UNRELEASED);
+            Version.V_5_0_3_UNRELEASED, Version.V_5_1_1, Version.V_5_1_2, Version.V_5_2_0);
         try (StreamInput in = StreamInput.wrap(data)) {
             in.setVersion(version);
             PutIndexTemplateRequest request = new PutIndexTemplateRequest();
diff --git a/core/src/test/java/org/elasticsearch/action/bulk/byscroll/BulkByScrollTaskStatusTests.java b/core/src/test/java/org/elasticsearch/action/bulk/byscroll/BulkByScrollTaskStatusTests.java
index b621264e7ea..a058841d759 100644
--- a/core/src/test/java/org/elasticsearch/action/bulk/byscroll/BulkByScrollTaskStatusTests.java
+++ b/core/src/test/java/org/elasticsearch/action/bulk/byscroll/BulkByScrollTaskStatusTests.java
@@ -74,7 +74,7 @@ public class BulkByScrollTaskStatusTests extends ESTestCase {
         assertEquals(expected.getRequestsPerSecond(), actual.getRequestsPerSecond(), 0f);
         assertEquals(expected.getReasonCancelled(), actual.getReasonCancelled());
         assertEquals(expected.getThrottledUntil(), actual.getThrottledUntil());
-        if (version.onOrAfter(Version.V_5_1_1_UNRELEASED)) {
+        if (version.onOrAfter(Version.V_5_1_1)) {
             assertThat(actual.getSliceStatuses(), hasSize(expected.getSliceStatuses().size()));
             for (int i = 0; i < expected.getSliceStatuses().size(); i++) {
                 BulkByScrollTask.StatusOrException sliceStatus = expected.getSliceStatuses().get(i);
diff --git a/core/src/test/java/org/elasticsearch/action/fieldstats/FieldStatsRequestTests.java b/core/src/test/java/org/elasticsearch/action/fieldstats/FieldStatsRequestTests.java
index f1cbaa9df3b..309e8445054 100644
--- a/core/src/test/java/org/elasticsearch/action/fieldstats/FieldStatsRequestTests.java
+++ b/core/src/test/java/org/elasticsearch/action/fieldstats/FieldStatsRequestTests.java
@@ -113,7 +113,7 @@ public class FieldStatsRequestTests extends ESTestCase {
             FieldStatsShardResponse deserialized = new FieldStatsShardResponse();
             deserialized.readFrom(input);
             final Map<String, FieldStats<?>> expected;
-            if (version.before(Version.V_5_2_0_UNRELEASED)) {
+            if (version.before(Version.V_5_2_0)) {
                 expected = deserialized.filterNullMinMax();
             } else {
                 expected = deserialized.getFieldStats();
diff --git a/core/src/test/java/org/elasticsearch/action/index/IndexRequestTests.java b/core/src/test/java/org/elasticsearch/action/index/IndexRequestTests.java
index 5b9649a7559..40a78a8848b 100644
--- a/core/src/test/java/org/elasticsearch/action/index/IndexRequestTests.java
+++ b/core/src/test/java/org/elasticsearch/action/index/IndexRequestTests.java
@@ -177,7 +177,7 @@ public class IndexRequestTests extends ESTestCase {
     public void testIndexRequestXContentSerializationBwc() throws IOException {
         final byte[] data = Base64.getDecoder().decode("AAD////+AgQDZm9vAAAAAQNiYXIBATEAAAAAAnt9AP/////////9AAAA//////////8AAAAAAAA=");
         final Version version = randomFrom(Version.V_5_0_0, Version.V_5_0_1, Version.V_5_0_2,
-            Version.V_5_0_3_UNRELEASED, Version.V_5_1_1_UNRELEASED, Version.V_5_1_2_UNRELEASED, Version.V_5_2_0_UNRELEASED);
+            Version.V_5_0_3_UNRELEASED, Version.V_5_1_1, Version.V_5_1_2, Version.V_5_2_0);
         try (StreamInput in = StreamInput.wrap(data)) {
             in.setVersion(version);
             IndexRequest serialized = new IndexRequest();
diff --git a/core/src/test/java/org/elasticsearch/action/ingest/PutPipelineRequestTests.java b/core/src/test/java/org/elasticsearch/action/ingest/PutPipelineRequestTests.java
index 01aed87947a..0b0d9763ecf 100644
--- a/core/src/test/java/org/elasticsearch/action/ingest/PutPipelineRequestTests.java
+++ b/core/src/test/java/org/elasticsearch/action/ingest/PutPipelineRequestTests.java
@@ -49,7 +49,7 @@ public class PutPipelineRequestTests extends ESTestCase {
     public void testSerializationBwc() throws IOException {
         final byte[] data = Base64.getDecoder().decode("ADwDATECe30=");
         final Version version = randomFrom(Version.V_5_0_0, Version.V_5_0_1, Version.V_5_0_2,
-            Version.V_5_0_3_UNRELEASED, Version.V_5_1_1_UNRELEASED, Version.V_5_1_2_UNRELEASED, Version.V_5_2_0_UNRELEASED);
+            Version.V_5_0_3_UNRELEASED, Version.V_5_1_1, Version.V_5_1_2, Version.V_5_2_0);
         try (StreamInput in = StreamInput.wrap(data)) {
             in.setVersion(version);
             PutPipelineRequest request = new PutPipelineRequest();
diff --git a/core/src/test/java/org/elasticsearch/action/ingest/SimulatePipelineRequestTests.java b/core/src/test/java/org/elasticsearch/action/ingest/SimulatePipelineRequestTests.java
index 86dc56cdd04..437d5465aca 100644
--- a/core/src/test/java/org/elasticsearch/action/ingest/SimulatePipelineRequestTests.java
+++ b/core/src/test/java/org/elasticsearch/action/ingest/SimulatePipelineRequestTests.java
@@ -74,7 +74,7 @@ public class SimulatePipelineRequestTests extends ESTestCase {
     public void testSerializationWithXContentBwc() throws IOException {
         final byte[] data = Base64.getDecoder().decode("AAAAAnt9AAA=");
         final Version version = randomFrom(Version.V_5_0_0, Version.V_5_0_1, Version.V_5_0_2,
-            Version.V_5_0_3_UNRELEASED, Version.V_5_1_1_UNRELEASED, Version.V_5_1_2_UNRELEASED, Version.V_5_2_0_UNRELEASED);
+            Version.V_5_0_3_UNRELEASED, Version.V_5_1_1, Version.V_5_1_2, Version.V_5_2_0);
         try (StreamInput in = StreamInput.wrap(data)) {
             in.setVersion(version);
             SimulatePipelineRequest request = new SimulatePipelineRequest();
diff --git a/core/src/test/java/org/elasticsearch/action/termvectors/TermVectorsUnitTests.java b/core/src/test/java/org/elasticsearch/action/termvectors/TermVectorsUnitTests.java
index e034cff3f1d..685cbcc54b3 100644
--- a/core/src/test/java/org/elasticsearch/action/termvectors/TermVectorsUnitTests.java
+++ b/core/src/test/java/org/elasticsearch/action/termvectors/TermVectorsUnitTests.java
@@ -269,7 +269,7 @@ public class TermVectorsUnitTests extends ESTestCase {
     public void testStreamRequestWithXContentBwc() throws IOException {
         final byte[] data = Base64.getDecoder().decode("AAABBWluZGV4BHR5cGUCaWQBAnt9AAABDnNvbWVQcmVmZXJlbmNlFgAAAAEA//////////0AAAA=");
         final Version version = randomFrom(Version.V_5_0_0, Version.V_5_0_1, Version.V_5_0_2,
-            Version.V_5_0_3_UNRELEASED, Version.V_5_1_1_UNRELEASED, Version.V_5_1_2_UNRELEASED, Version.V_5_2_0_UNRELEASED);
+            Version.V_5_0_3_UNRELEASED, Version.V_5_1_1, Version.V_5_1_2, Version.V_5_2_0);
         try (StreamInput in = StreamInput.wrap(data)) {
             in.setVersion(version);
             TermVectorsRequest request = new TermVectorsRequest();
diff --git a/core/src/test/java/org/elasticsearch/common/io/stream/BytesStreamsTests.java b/core/src/test/java/org/elasticsearch/common/io/stream/BytesStreamsTests.java
index 4a02a1f345b..74a8c50b656 100644
--- a/core/src/test/java/org/elasticsearch/common/io/stream/BytesStreamsTests.java
+++ b/core/src/test/java/org/elasticsearch/common/io/stream/BytesStreamsTests.java
@@ -805,7 +805,7 @@ public class BytesStreamsTests extends ESTestCase {
         }
 
         assertTrue("If we're not compatible with 5.1.1 we can drop the assertion below",
-                Version.CURRENT.minimumCompatibilityVersion().onOrBefore(Version.V_5_1_1_UNRELEASED));
+                Version.CURRENT.minimumCompatibilityVersion().onOrBefore(Version.V_5_1_1));
         /* Read -1 as serialized by a version of Elasticsearch that supported writing negative numbers with writeVLong. Note that this
          * should be the same test as the first case (when value is negative) but we've kept some bytes so no matter what we do to
          * writeVLong in the future we can be sure we can read bytes as written by Elasticsearch before 5.1.2 */
diff --git a/core/src/test/java/org/elasticsearch/fieldstats/FieldStatsTests.java b/core/src/test/java/org/elasticsearch/fieldstats/FieldStatsTests.java
index d514cce2223..577bc20f1c8 100644
--- a/core/src/test/java/org/elasticsearch/fieldstats/FieldStatsTests.java
+++ b/core/src/test/java/org/elasticsearch/fieldstats/FieldStatsTests.java
@@ -606,7 +606,7 @@ public class FieldStatsTests extends ESSingleNodeTestCase {
     public void testSerialization() throws IOException {
         for (Version version : new Version[] {Version.CURRENT, Version.V_5_0_1}){
             for (int i = 0; i < 20; i++) {
-                assertSerialization(randomFieldStats(version.onOrAfter(Version.V_5_2_0_UNRELEASED)), version);
+                assertSerialization(randomFieldStats(version.onOrAfter(Version.V_5_2_0)), version);
             }
         }
     }
diff --git a/core/src/test/java/org/elasticsearch/index/query/MoreLikeThisQueryBuilderTests.java b/core/src/test/java/org/elasticsearch/index/query/MoreLikeThisQueryBuilderTests.java
index ee1265eca65..7e3989c866a 100644
--- a/core/src/test/java/org/elasticsearch/index/query/MoreLikeThisQueryBuilderTests.java
+++ b/core/src/test/java/org/elasticsearch/index/query/MoreLikeThisQueryBuilderTests.java
@@ -308,7 +308,7 @@ public class MoreLikeThisQueryBuilderTests extends AbstractQueryTestCase<MoreLik
     public void testItemSerializationBwc() throws IOException {
         final byte[] data = Base64.getDecoder().decode("AQVpbmRleAEEdHlwZQEODXsiZm9vIjoiYmFyIn0A/wD//////////QAAAAAAAAAA");
         final Version version = randomFrom(Version.V_5_0_0, Version.V_5_0_1, Version.V_5_0_2,
-            Version.V_5_0_3_UNRELEASED, Version.V_5_1_1_UNRELEASED, Version.V_5_1_2_UNRELEASED, Version.V_5_2_0_UNRELEASED);
+            Version.V_5_0_3_UNRELEASED, Version.V_5_1_1, Version.V_5_1_2, Version.V_5_2_0);
         try (StreamInput in = StreamInput.wrap(data)) {
             in.setVersion(version);
             Item item = new Item(in);
diff --git a/core/src/test/java/org/elasticsearch/index/refresh/RefreshStatsTests.java b/core/src/test/java/org/elasticsearch/index/refresh/RefreshStatsTests.java
index 91ac42628e6..e19c21e8524 100644
--- a/core/src/test/java/org/elasticsearch/index/refresh/RefreshStatsTests.java
+++ b/core/src/test/java/org/elasticsearch/index/refresh/RefreshStatsTests.java
@@ -37,10 +37,10 @@ public class RefreshStatsTests extends AbstractStreamableTestCase<RefreshStats>
 
     public void testPre5Dot2() throws IOException {
         // We can drop the compatibility once the assertion just below this list fails
-        assertTrue(Version.CURRENT.minimumCompatibilityVersion().before(Version.V_5_2_0_UNRELEASED));
+        assertTrue(Version.CURRENT.minimumCompatibilityVersion().before(Version.V_5_2_0));
 
         RefreshStats instance = createTestInstance();
-        RefreshStats copied = copyInstance(instance, Version.V_5_1_1_UNRELEASED);
+        RefreshStats copied = copyInstance(instance, Version.V_5_1_1);
         assertEquals(instance.getTotal(), copied.getTotal());
         assertEquals(instance.getTotalTimeInMillis(), copied.getTotalTimeInMillis());
         assertEquals(0, copied.getListeners());
diff --git a/core/src/test/java/org/elasticsearch/ingest/PipelineConfigurationTests.java b/core/src/test/java/org/elasticsearch/ingest/PipelineConfigurationTests.java
index f41d01b32c8..f44af2bd9d0 100644
--- a/core/src/test/java/org/elasticsearch/ingest/PipelineConfigurationTests.java
+++ b/core/src/test/java/org/elasticsearch/ingest/PipelineConfigurationTests.java
@@ -55,7 +55,7 @@ public class PipelineConfigurationTests extends ESTestCase {
     public void testSerializationBwc() throws IOException {
         final byte[] data = Base64.getDecoder().decode("ATECe30AAAA=");
         final Version version = randomFrom(Version.V_5_0_0, Version.V_5_0_1, Version.V_5_0_2,
-            Version.V_5_0_3_UNRELEASED, Version.V_5_1_1_UNRELEASED, Version.V_5_1_2_UNRELEASED, Version.V_5_2_0_UNRELEASED);
+            Version.V_5_0_3_UNRELEASED, Version.V_5_1_1, Version.V_5_1_2, Version.V_5_2_0);
         try (StreamInput in = StreamInput.wrap(data)) {
             in.setVersion(version);
             PipelineConfiguration configuration = PipelineConfiguration.readFrom(in);
diff --git a/modules/percolator/src/test/java/org/elasticsearch/percolator/PercolateQueryBuilderTests.java b/modules/percolator/src/test/java/org/elasticsearch/percolator/PercolateQueryBuilderTests.java
index 23f3fc77c20..6c08a949b80 100644
--- a/modules/percolator/src/test/java/org/elasticsearch/percolator/PercolateQueryBuilderTests.java
+++ b/modules/percolator/src/test/java/org/elasticsearch/percolator/PercolateQueryBuilderTests.java
@@ -250,7 +250,7 @@ public class PercolateQueryBuilderTests extends AbstractQueryTestCase<PercolateQ
     public void testSerializationBwc() throws IOException {
         final byte[] data = Base64.getDecoder().decode("P4AAAAAFZmllbGQEdHlwZQAAAAAAAA57ImZvbyI6ImJhciJ9AAAAAA==");
         final Version version = randomFrom(Version.V_5_0_0, Version.V_5_0_1, Version.V_5_0_2,
-            Version.V_5_0_3_UNRELEASED, Version.V_5_1_1_UNRELEASED, Version.V_5_1_2_UNRELEASED, Version.V_5_2_0_UNRELEASED);
+            Version.V_5_0_3_UNRELEASED, Version.V_5_1_1, Version.V_5_1_2, Version.V_5_2_0);
         try (StreamInput in = StreamInput.wrap(data)) {
             in.setVersion(version);
             PercolateQueryBuilder queryBuilder = new PercolateQueryBuilder(in);
diff --git a/modules/reindex/src/main/java/org/elasticsearch/index/reindex/remote/RemoteInfo.java b/modules/reindex/src/main/java/org/elasticsearch/index/reindex/remote/RemoteInfo.java
index 5fad275cde4..37ab5ce5647 100644
--- a/modules/reindex/src/main/java/org/elasticsearch/index/reindex/remote/RemoteInfo.java
+++ b/modules/reindex/src/main/java/org/elasticsearch/index/reindex/remote/RemoteInfo.java
@@ -90,7 +90,7 @@ public class RemoteInfo implements Writeable {
             headers.put(in.readString(), in.readString());
         }
         this.headers = unmodifiableMap(headers);
-        if (in.getVersion().onOrAfter(Version.V_5_2_0_UNRELEASED)) {
+        if (in.getVersion().onOrAfter(Version.V_5_2_0)) {
             socketTimeout = new TimeValue(in);
             connectTimeout = new TimeValue(in);
         } else {
@@ -112,7 +112,7 @@ public class RemoteInfo implements Writeable {
             out.writeString(header.getKey());
             out.writeString(header.getValue());
         }
-        if (out.getVersion().onOrAfter(Version.V_5_2_0_UNRELEASED)) {
+        if (out.getVersion().onOrAfter(Version.V_5_2_0)) {
             socketTimeout.writeTo(out);
             connectTimeout.writeTo(out);
         }
diff --git a/modules/reindex/src/test/java/org/elasticsearch/index/reindex/RoundTripTests.java b/modules/reindex/src/test/java/org/elasticsearch/index/reindex/RoundTripTests.java
index abc0d6e1f35..92f2bdc047b 100644
--- a/modules/reindex/src/test/java/org/elasticsearch/index/reindex/RoundTripTests.java
+++ b/modules/reindex/src/test/java/org/elasticsearch/index/reindex/RoundTripTests.java
@@ -162,7 +162,7 @@ public class RoundTripTests extends ESTestCase {
             assertEquals(request.getRemoteInfo().getUsername(), tripped.getRemoteInfo().getUsername());
             assertEquals(request.getRemoteInfo().getPassword(), tripped.getRemoteInfo().getPassword());
             assertEquals(request.getRemoteInfo().getHeaders(), tripped.getRemoteInfo().getHeaders());
-            if (version.onOrAfter(Version.V_5_2_0_UNRELEASED)) {
+            if (version.onOrAfter(Version.V_5_2_0)) {
                 assertEquals(request.getRemoteInfo().getSocketTimeout(), tripped.getRemoteInfo().getSocketTimeout());
                 assertEquals(request.getRemoteInfo().getConnectTimeout(), tripped.getRemoteInfo().getConnectTimeout());
             } else {