ESQL: Added Sample operator NamedWritable to plugin

Author: ivancea

x-pack/plugin/esql/compute/src/main/java/org/elasticsearch/compute/operator/SampleOperator.java

@@ -167,7 +167,7 @@ public Operator.Status status() {
         return new Status(collectNanos, emitNanos, pagesProcessed, rowsReceived, rowsEmitted);
     }
 
-    private record Status(long collectNanos, long emitNanos, int pagesProcessed, int rowsReceived, int rowsEmitted)
+    public record Status(long collectNanos, long emitNanos, int pagesProcessed, int rowsReceived, int rowsEmitted)
         implements
             Operator.Status {
 

x-pack/plugin/esql/src/main/java/org/elasticsearch/xpack/esql/plugin/EsqlPlugin.java

@@ -32,6 +32,7 @@
 import org.elasticsearch.compute.operator.HashAggregationOperator;
 import org.elasticsearch.compute.operator.LimitOperator;
 import org.elasticsearch.compute.operator.MvExpandOperator;
+import org.elasticsearch.compute.operator.SampleOperator;
 import org.elasticsearch.compute.operator.exchange.ExchangeService;
 import org.elasticsearch.compute.operator.exchange.ExchangeSinkOperator;
 import org.elasticsearch.compute.operator.exchange.ExchangeSourceOperator;
@@ -321,6 +322,7 @@ public List<NamedWriteableRegistry.Entry> getNamedWriteables() {
         entries.add(AsyncOperator.Status.ENTRY);
         entries.add(EnrichLookupOperator.Status.ENTRY);
         entries.add(LookupFromIndexOperator.Status.ENTRY);
+        entries.add(SampleOperator.Status.ENTRY);
         entries.add(ExpressionQueryBuilder.ENTRY);
         entries.add(PlanStreamWrapperQueryBuilder.ENTRY);