DATAES-504 - Update documentation.

Update documentation to cover newly added configuration options for the ReactiveElasticsearchClient.
Make sure to apply postFilter correctly and set a default limit for unpaged search requests.

Also fix some code format issues.

src/test/java/org/springframework/data/elasticsearch/TestUtils.java

@@ -18,6 +18,7 @@ package org.springframework.data.elasticsearch;
 import lombok.SneakyThrows;
 
 import java.io.IOException;
+import java.time.Duration;
 
 import org.elasticsearch.ElasticsearchStatusException;
 import org.elasticsearch.action.admin.indices.delete.DeleteIndexRequest;
@@ -41,12 +42,15 @@ public final class TestUtils {
 
 	private TestUtils() {}
 
+	private static final ClientConfiguration CONFIG = ClientConfiguration.builder().connectedToLocalhost()
+			.withConnectTimeout(Duration.ofSeconds(5)).withSocketTimeout(Duration.ofSeconds(3)).build();
+
 	public static RestHighLevelClient restHighLevelClient() {
-		return RestClients.create(ClientConfiguration.create("localhost:9200")).rest();
+		return RestClients.create(CONFIG).rest();
 	}
 
 	public static ReactiveElasticsearchClient reactiveClient() {
-		return ReactiveRestClients.create(ClientConfiguration.create("localhost:9200"));
+		return ReactiveRestClients.create(CONFIG);
 	}
 
 	public static Version serverVersion() {

src/test/java/org/springframework/data/elasticsearch/client/reactive/ReactiveElasticsearchClientTests.java

@@ -17,12 +17,10 @@ package org.springframework.data.elasticsearch.client.reactive;
 
 import static org.assertj.core.api.Assertions.*;
 
-import org.junit.Rule;
-import org.springframework.data.elasticsearch.ElasticsearchVersion;
-import org.springframework.data.elasticsearch.ElasticsearchVersionRule;
 import reactor.test.StepVerifier;
 
 import java.io.IOException;
+import java.time.Duration;
 import java.util.Collections;
 import java.util.LinkedHashMap;
 import java.util.Map;
@@ -45,10 +43,13 @@ import org.elasticsearch.rest.RestStatus;
 import org.elasticsearch.search.builder.SearchSourceBuilder;
 import org.junit.After;
 import org.junit.Before;
+import org.junit.Rule;
 import org.junit.Test;
 import org.junit.runner.RunWith;
+import org.springframework.data.elasticsearch.ElasticsearchVersion;
+import org.springframework.data.elasticsearch.ElasticsearchVersionRule;
 import org.springframework.data.elasticsearch.TestUtils;
-import org.springframework.http.HttpHeaders;
+import org.springframework.data.elasticsearch.client.ClientConfiguration;
 import org.springframework.lang.Nullable;
 import org.springframework.test.context.ContextConfiguration;
 import org.springframework.test.context.junit4.SpringRunner;
@@ -109,7 +110,10 @@ public class ReactiveElasticsearchClientTests {
 	@Test // DATAES-488
 	public void pingForUnknownHostShouldReturnFalse() {
 
-		DefaultReactiveElasticsearchClient.create(HttpHeaders.EMPTY, "http://localhost:4711").ping() //
+		DefaultReactiveElasticsearchClient
+				.create(ClientConfiguration.builder().connectedTo("localhost:4711")
+						.withConnectTimeout(Duration.ofSeconds(2)).build())
+				.ping() //
 				.as(StepVerifier::create) //
 				.expectNext(false) //
 				.verifyComplete();

src/test/java/org/springframework/data/elasticsearch/core/ReactiveElasticsearchTemplateTests.java

@@ -440,7 +440,7 @@ public class ReactiveElasticsearchTemplateTests {
 
 	@Test // DATAES-504
 	@ElasticsearchVersion(asOf = "6.5.0")
-	public void deleteByQueryShouldReturnZeroIfNothingDeleted() throws Exception {
+	public void deleteByQueryShouldReturnZeroIfNothingDeleted() {
 
 		index(randomEntity("test message"));
 

src/test/java/org/springframework/data/elasticsearch/core/ReactiveElasticsearchTemplateUnitTests.java

@@ -19,6 +19,8 @@ import static org.assertj.core.api.Assertions.*;
 import static org.elasticsearch.action.search.SearchRequest.*;
 import static org.mockito.Mockito.*;
 
+import org.springframework.data.domain.PageRequest;
+import org.springframework.data.domain.Pageable;
 import reactor.core.publisher.Flux;
 import reactor.core.publisher.Mono;
 import reactor.test.StepVerifier;
@@ -118,6 +120,36 @@ public class ReactiveElasticsearchTemplateUnitTests {
 		assertThat(captor.getValue().indicesOptions()).isEqualTo(IndicesOptions.LENIENT_EXPAND_OPEN);
 	}
 
+	@Test // DATAES-504
+	public void findShouldApplyPaginationIfSet() {
+
+		ArgumentCaptor<SearchRequest> captor = ArgumentCaptor.forClass(SearchRequest.class);
+		when(client.search(captor.capture())).thenReturn(Flux.empty());
+
+
+		template.find(new CriteriaQuery(new Criteria("*")).setPageable(PageRequest.of(2, 50)), SampleEntity.class) //
+				.as(StepVerifier::create) //
+				.verifyComplete();
+
+		assertThat(captor.getValue().source().from()).isEqualTo(100);
+		assertThat(captor.getValue().source().size()).isEqualTo(50);
+	}
+
+	@Test // DATAES-504
+	public void findShouldApplyDefaultMaxIfPaginationNotSet() {
+
+		ArgumentCaptor<SearchRequest> captor = ArgumentCaptor.forClass(SearchRequest.class);
+		when(client.search(captor.capture())).thenReturn(Flux.empty());
+
+
+		template.find(new CriteriaQuery(new Criteria("*")).setPageable(Pageable.unpaged()), SampleEntity.class) //
+				.as(StepVerifier::create) //
+				.verifyComplete();
+
+		assertThat(captor.getValue().source().from()).isEqualTo(0);
+		assertThat(captor.getValue().source().size()).isEqualTo(10000);
+	}
+
 	@Test // DATAES-504
 	public void deleteShouldUseDefaultRefreshPolicy() {