- Added configuration parameters for search coordinator thread pool sizes

- Added database connection pool size configuration parameter (spring.datasource.hikari.maximum-pool-size)
- Fixed a bug in parsing elastic rest_url for all FHIR versions except for R4, which was correct.

src/main/java/ca/uhn/fhir/jpa/starter/FhirServerConfigR4.java

@@ -12,6 +12,7 @@ import org.springframework.core.env.ConfigurableEnvironment;
 import org.springframework.orm.jpa.JpaTransactionManager;
 import org.springframework.orm.jpa.LocalContainerEntityManagerFactoryBean;
 
+import javax.annotation.PostConstruct;
 import javax.persistence.EntityManagerFactory;
 import javax.sql.DataSource;
 
@@ -31,6 +32,19 @@ public class FhirServerConfigR4 extends BaseJavaConfigR4 {
   @Autowired
   AppProperties appProperties;
 
+  @PostConstruct
+  public void initSettings() {
+    if(appProperties.getSearch_coord_core_pool_size() != null) {
+		 setSearchCoordCorePoolSize(appProperties.getSearch_coord_core_pool_size());
+	 }
+	  if(appProperties.getSearch_coord_max_pool_size() != null) {
+		  setSearchCoordMaxPoolSize(appProperties.getSearch_coord_max_pool_size());
+	  }
+	  if(appProperties.getSearch_coord_queue_capacity() != null) {
+		  setSearchCoordQueueCapacity(appProperties.getSearch_coord_queue_capacity());
+	  }
+  }
+
   @Override
   public DatabaseBackedPagingProvider databaseBackedPagingProvider() {
     DatabaseBackedPagingProvider pagingProvider = super.databaseBackedPagingProvider();