Polishing.

Add $median to documentation. Add test to ensure adherence to TypedAggregationContext. Remove duplicate imports.

See #4472
Original Pull Request: #4515

Author: sxhinzvc

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

@@ -32,8 +32,6 @@
 import org.springframework.data.mongodb.core.aggregation.AccumulatorOperators.Sum;
 import org.springframework.data.mongodb.core.aggregation.SetWindowFieldsOperation.WindowUnit;
 import org.springframework.data.mongodb.core.aggregation.SetWindowFieldsOperation.WindowUnits;
-import org.springframework.data.mongodb.core.aggregation.SetWindowFieldsOperation.WindowUnit;
-import org.springframework.data.mongodb.core.aggregation.SetWindowFieldsOperation.WindowUnits;
 import org.springframework.lang.Nullable;
 import org.springframework.util.Assert;
 import org.springframework.util.ObjectUtils;

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

@@ -152,6 +152,14 @@ void rendersMedianWithExpression() {
 				.isEqualTo(Document.parse("{ $median: { input: [\"$scoreOne\", {\"$sum\": \"$scoreTwo\"}], method: \"approximate\" } }"));
 	}
 
+	@Test // GH-4472
+	void rendersMedianCorrectlyWithTypedAggregationContext() {
+
+		assertThat(valueOf("midichlorianCount").median()
+				.toDocument(TestAggregationContext.contextFor(Jedi.class)))
+						.isEqualTo(Document.parse("{ $median: { input: \"$force\", method: \"approximate\" } }"));
+	}
+
 	static class Jedi {
 
 		String name;

src/main/antora/modules/ROOT/pages/mongodb/aggregation-framework.adoc

@@ -112,7 +112,7 @@ At the time of this writing, we provide support for the following Aggregation Op
 | `setEquals`, `setIntersection`, `setUnion`, `setDifference`, `setIsSubset`, `anyElementTrue`, `allElementsTrue`
 
 | Group/Accumulator Aggregation Operators
-| `addToSet`, `bottom`, `bottomN`, `covariancePop`, `covarianceSamp`, `expMovingAvg`, `first`, `firstN`, `last`, `lastN` `max`, `maxN`, `min`, `minN`, `avg`, `push`, `sum`, `top`, `topN`, `count` (+++*+++), `percentile`, `stdDevPop`, `stdDevSamp`
+| `addToSet`, `bottom`, `bottomN`, `covariancePop`, `covarianceSamp`, `expMovingAvg`, `first`, `firstN`, `last`, `lastN` `max`, `maxN`, `min`, `minN`, `avg`, `push`, `sum`, `top`, `topN`, `count` (+++*+++), `median`, `percentile`, `stdDevPop`, `stdDevSamp`
 
 | Arithmetic Aggregation Operators
 | `abs`, `acos`, `acosh`, `add` (+++*+++ via `plus`), `asin`, `asin`, `atan`, `atan2`, `atanh`, `ceil`, `cos`, `cosh`, `derivative`, `divide`, `exp`, `floor`, `integral`, `ln`, `log`, `log10`, `mod`, `multiply`, `pow`, `round`, `sqrt`, `subtract` (+++*+++ via `minus`), `sin`, `sinh`, `tan`, `tanh`, `trunc`