fix esql metrics test

Author: jan-elastic

x-pack/plugin/src/yamlRestTest/resources/rest-api-spec/test/esql/60_usage.yml

@@ -39,7 +39,7 @@ setup:
   - do: {xpack.usage: {}}
   - match: { esql.available: true }
   - match: { esql.enabled: true }
-  - length: { esql.features: 25 }
+  - length: { esql.features: 26 }
   - set: {esql.features.dissect: dissect_counter}
   - set: {esql.features.drop: drop_counter}
   - set: {esql.features.eval: eval_counter}
@@ -65,6 +65,7 @@ setup:
   - set: {esql.features.fork: fork_counter}
   - set: {esql.features.rrf: rrf_counter}
   - set: {esql.features.completion: completion_counter}
+  - set: {esql.features.sample: sample_counter}
   - length: { esql.queries: 3 }
   - set: {esql.queries.rest.total: rest_total_counter}
   - set: {esql.queries.rest.failed: rest_failed_counter}
@@ -108,6 +109,7 @@ setup:
   - match: {esql.features.fork: $fork_counter}
   - match: {esql.features.rrf: $rrf_counter}
   - match: {esql.features.completion: $completion_counter}
+  - match: {esql.features.sample: $sample_counter}
   - gt: {esql.queries.rest.total: $rest_total_counter}
   - match: {esql.queries.rest.failed: $rest_failed_counter}
   - match: {esql.queries.kibana.total: $kibana_total_counter}