Re-remove min compatible version from SearchRequest (elastic#123859)

Re-apply transport changes from elastic#114713

Author: thecoop

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

@@ -208,6 +208,7 @@ static TransportVersion def(int id) {
     public static final TransportVersion MULTI_PROJECT = def(9_018_0_00);
     public static final TransportVersion STORED_SCRIPT_CONTENT_LENGTH = def(9_019_0_00);
     public static final TransportVersion JINA_AI_EMBEDDING_TYPE_SUPPORT_ADDED = def(9_020_0_00);
+    public static final TransportVersion RE_REMOVE_MIN_COMPATIBLE_SHARD_NODE = def(9_021_0_00);
 
     /*
      * STOP! READ THIS FIRST! No, really,

server/src/main/java/org/elasticsearch/action/search/SearchRequest.java

@@ -20,7 +20,6 @@
 import org.elasticsearch.common.io.stream.StreamOutput;
 import org.elasticsearch.core.Nullable;
 import org.elasticsearch.core.TimeValue;
-import org.elasticsearch.core.UpdateForV9;
 import org.elasticsearch.index.mapper.SourceLoader;
 import org.elasticsearch.index.query.QueryRewriteContext;
 import org.elasticsearch.index.query.Rewriteable;
@@ -254,10 +253,8 @@ public SearchRequest(StreamInput in) throws IOException {
             finalReduce = true;
         }
         ccsMinimizeRoundtrips = in.readBoolean();
-        if ((in.getTransportVersion().before(TransportVersions.REMOVE_MIN_COMPATIBLE_SHARD_NODE)
-            || in.getTransportVersion().onOrAfter(TransportVersions.REVERT_REMOVE_MIN_COMPATIBLE_SHARD_NODE)) && in.readBoolean()) {
-            @UpdateForV9(owner = UpdateForV9.Owner.CORE_INFRA)  // this can be removed (again) when the v9 transport version can diverge
-            Version v = Version.readVersion(in); // and drop on the floor
+        if (in.getTransportVersion().before(TransportVersions.RE_REMOVE_MIN_COMPATIBLE_SHARD_NODE) && in.readBoolean()) {
+            Version.readVersion(in); // and drop on the floor
         }
         waitForCheckpoints = in.readMap(StreamInput::readLongArray);
         waitForCheckpointsTimeout = in.readTimeValue();
@@ -293,8 +290,7 @@ public void writeTo(StreamOutput out) throws IOException {
             out.writeBoolean(finalReduce);
         }
         out.writeBoolean(ccsMinimizeRoundtrips);
-        if (out.getTransportVersion().before(TransportVersions.REMOVE_MIN_COMPATIBLE_SHARD_NODE)
-            || out.getTransportVersion().onOrAfter(TransportVersions.REVERT_REMOVE_MIN_COMPATIBLE_SHARD_NODE)) {
+        if (out.getTransportVersion().before(TransportVersions.RE_REMOVE_MIN_COMPATIBLE_SHARD_NODE)) {
             out.writeBoolean(false);
         }
         out.writeMap(waitForCheckpoints, StreamOutput::writeLongArray);