Credit for #1220

hapi-fhir-jpaserver-uhnfhirtest/src/main/java/ca/uhn/fhirtest/config/TestDstu2Config.java

@@ -73,6 +73,7 @@ public class TestDstu2Config extends BaseJavaConfigDstu2 {
 		retVal.setIndexMissingFields(DaoConfig.IndexEnabledEnum.ENABLED);
 		retVal.setFetchSizeDefaultMaximum(10000);
 		retVal.setWebsocketContextPath("/");
+		retVal.setFilterParameterEnabled(true);
 		return retVal;
 	}
 

hapi-fhir-jpaserver-uhnfhirtest/src/main/java/ca/uhn/fhirtest/config/TestDstu3Config.java

@@ -64,6 +64,7 @@ public class TestDstu3Config extends BaseJavaConfigDstu3 {
 		retVal.setFetchSizeDefaultMaximum(10000);
 		retVal.setReindexThreadCount(1);
 		retVal.setExpungeEnabled(true);
+		retVal.setFilterParameterEnabled(true);
 		return retVal;
 	}
 

hapi-fhir-jpaserver-uhnfhirtest/src/main/java/ca/uhn/fhirtest/config/TestR4Config.java

@@ -64,6 +64,7 @@ public class TestR4Config extends BaseJavaConfigR4 {
 		retVal.setCountSearchResultsUpTo(TestR4Config.COUNT_SEARCH_RESULTS_UP_TO);
 		retVal.setFetchSizeDefaultMaximum(10000);
 		retVal.setExpungeEnabled(true);
+		retVal.setFilterParameterEnabled(true);
 		return retVal;
 	}
 

hapi-fhir-jpaserver-uhnfhirtest/src/main/java/ca/uhn/fhirtest/config/TestR5Config.java

@@ -64,6 +64,7 @@ public class TestR5Config extends BaseJavaConfigR5 {
 		retVal.setCountSearchResultsUpTo(TestR5Config.COUNT_SEARCH_RESULTS_UP_TO);
 		retVal.setFetchSizeDefaultMaximum(10000);
 		retVal.setExpungeEnabled(true);
+		retVal.setFilterParameterEnabled(true);
 		return retVal;
 	}
 

pom.xml

@@ -539,6 +539,10 @@
 			<id>uurl</id>
 			<name>Raul Estrada</name>
 		</developer>
+		<developer>
+			<id>anthonys123</id>
+			<name>Anthony Sute</name>
+		</developer>
 	</developers>
 
 	<licenses>

src/changes/changes.xml

@@ -111,6 +111,18 @@
 				The JPA server now supports GraphQL for DSTU3 / R4 / R5 servers.
 				]]>
 			</action>
+			<action type="add" issue="1220">
+				<![CDATA[
+				<b>New Feature</b>:
+				The JPA server now supports the <code>_filter</code> search parameter when configured to
+				do so. The <a href="http://hl7.org/fhir/search_filter.html">filter search parameter</a>
+				is an extremely flexible and powerful feature, allowing for advanced grouping and order of
+				operations on searches. It can be dangerous however, as it potentially allows users to create
+				queries for which no database indexes exist in the default configuration so it is disabled by
+				default. Thanks to Anthony Sute for the pull request and all of his support in what turned
+				out to be a lengthy merge!
+				]]>
+			</action>
 			<action type="add">
 				Several enhancements have been made to the <![CDATA[<code>AuthorizationInterceptor</code>]]>:
 				<![CDATA[