fix checkstyle after merge (#52008)

Author: not-napoleon

server/src/main/java/org/elasticsearch/search/aggregations/bucket/histogram/HistogramAggregationBuilder.java

@@ -90,7 +90,7 @@ public static HistogramAggregationBuilder parse(String aggregationName, XContent
 
     private static AtomicBoolean wasRegistered = new AtomicBoolean(false);
     public static void registerAggregators(ValuesSourceRegistry valuesSourceRegistry) {
-        if (wasRegistered.compareAndSet(false, true) == true) {
+        if (wasRegistered.compareAndSet(false, true)) {
             HistogramAggregatorFactory.registerAggregators(valuesSourceRegistry);
         }
     }

server/src/main/java/org/elasticsearch/search/aggregations/bucket/terms/TermsAggregationBuilder.java

@@ -104,7 +104,7 @@ public static AggregationBuilder parse(String aggregationName, XContentParser pa
 
     private static AtomicBoolean wasRegistered = new AtomicBoolean(false);
     public static void registerAggregators(ValuesSourceRegistry valuesSourceRegistry) {
-        if (wasRegistered.compareAndSet(false, true) == true) {
+        if (wasRegistered.compareAndSet(false, true)) {
             TermsAggregatorFactory.registerAggregators(valuesSourceRegistry);
         }
     }

server/src/main/java/org/elasticsearch/search/aggregations/metrics/CardinalityAggregationBuilder.java

@@ -65,7 +65,7 @@ public static AggregationBuilder parse(String aggregationName, XContentParser pa
 
     private static AtomicBoolean wasRegistered = new AtomicBoolean(false);
     public static void registerAggregators(ValuesSourceRegistry valuesSourceRegistry) {
-        if (wasRegistered.compareAndSet(false, true) == true) {
+        if (wasRegistered.compareAndSet(false, true)) {
             CardinalityAggregatorFactory.registerAggregators(valuesSourceRegistry);
         }
     }

server/src/main/java/org/elasticsearch/search/aggregations/metrics/PercentilesAggregationBuilder.java

@@ -121,7 +121,7 @@ public static AggregationBuilder parse(String aggregationName, XContentParser pa
 
     private static AtomicBoolean wasRegistered = new AtomicBoolean(false);
     public static void registerAggregators(ValuesSourceRegistry valuesSourceRegistry) {
-        if (wasRegistered.compareAndSet(false, true) == true) {
+        if (wasRegistered.compareAndSet(false, true)) {
             PercentilesAggregatorFactory.registerAggregators(valuesSourceRegistry);
         }
     }