Polishing.

Reformat code.

See #3712
Original pull request: #3740.

spring-data-mongodb/src/main/java/org/springframework/data/mongodb/core/aggregation/AccumulatorOperators.java

@@ -143,8 +143,8 @@ public StdDevSamp stdDevSamp() {
 		}
 
 		/**
-		 * Creates new {@link AggregationExpression} that uses the previous input (field/expression) and the value of the given
-		 * field to calculate the population covariance of the two.
+		 * Creates new {@link AggregationExpression} that uses the previous input (field/expression) and the value of the
+		 * given field to calculate the population covariance of the two.
 		 *
 		 * @param fieldReference must not be {@literal null}.
 		 * @return new instance of {@link CovariancePop}.
@@ -155,8 +155,8 @@ public CovariancePop covariancePop(String fieldReference) {
 		}
 
 		/**
-		 * Creates new {@link AggregationExpression} that uses the previous input (field/expression) and the result of the given
-		 * {@link AggregationExpression expression} to calculate the population covariance of the two.
+		 * Creates new {@link AggregationExpression} that uses the previous input (field/expression) and the result of the
+		 * given {@link AggregationExpression expression} to calculate the population covariance of the two.
 		 *
 		 * @param expression must not be {@literal null}.
 		 * @return new instance of {@link CovariancePop}.
@@ -171,8 +171,8 @@ private CovariancePop covariancePop() {
 		}
 
 		/**
-		 * Creates new {@link AggregationExpression} that uses the previous input (field/expression) and the value of the given
-		 * field to calculate the sample covariance of the two.
+		 * Creates new {@link AggregationExpression} that uses the previous input (field/expression) and the value of the
+		 * given field to calculate the sample covariance of the two.
 		 *
 		 * @param fieldReference must not be {@literal null}.
 		 * @return new instance of {@link CovariancePop}.
@@ -183,8 +183,8 @@ public CovarianceSamp covarianceSamp(String fieldReference) {
 		}
 
 		/**
-		 * Creates new {@link AggregationExpression} that uses the previous input (field/expression) and the result of the given
-		 * {@link AggregationExpression expression} to calculate the sample covariance of the two.
+		 * Creates new {@link AggregationExpression} that uses the previous input (field/expression) and the result of the
+		 * given {@link AggregationExpression expression} to calculate the sample covariance of the two.
 		 *
 		 * @param expression must not be {@literal null}.
 		 * @return new instance of {@link CovariancePop}.

spring-data-mongodb/src/test/java/org/springframework/data/mongodb/core/aggregation/AccumulatorOperatorsUnitTests.java

@@ -27,6 +27,8 @@
 import org.springframework.data.mongodb.util.aggregation.TestAggregationContext;
 
 /**
+ * Unit tests for {@link AccumulatorOperators}.
+ *
  * @author Christoph Strobl
  */
 class AccumulatorOperatorsUnitTests {