DATAES-859 - No randomnumeric in tests.

Original PR: spring-projects#479

Author: sothawo

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

@@ -15,9 +15,9 @@
  */
 package org.springframework.data.elasticsearch;
 
-import static org.apache.commons.lang.RandomStringUtils.*;
 import static org.assertj.core.api.Assertions.*;
 import static org.elasticsearch.index.query.QueryBuilders.*;
+import static org.springframework.data.elasticsearch.utils.IdGenerator.*;
 
 import lombok.Data;
 import lombok.Getter;
@@ -343,10 +343,10 @@ public void shouldIndexAndSearchMapAsNestedType() {
 		Book book1 = new Book();
 		Book book2 = new Book();
 
-		book1.setId(randomNumeric(5));
+		book1.setId(nextIdAsString());
 		book1.setName("testBook1");
 
-		book2.setId(randomNumeric(5));
+		book2.setId(nextIdAsString());
 		book2.setName("testBook2");
 
 		Map<Integer, Collection<String>> map1 = new HashMap<>();

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

@@ -15,9 +15,9 @@
  */
 package org.springframework.data.elasticsearch.core;
 
-import static org.apache.commons.lang.RandomStringUtils.*;
 import static org.assertj.core.api.Assertions.*;
 import static org.springframework.data.elasticsearch.annotations.FieldType.*;
+import static org.springframework.data.elasticsearch.utils.IdGenerator.*;
 
 import lombok.Builder;
 import lombok.Data;
@@ -67,7 +67,7 @@ public void shouldThrowExceptionIfDocumentDoesNotExistWhileDoingPartialUpdate()
 		// when
 		org.springframework.data.elasticsearch.core.document.Document document = org.springframework.data.elasticsearch.core.document.Document
 				.create();
-		UpdateQuery updateQuery = UpdateQuery.builder(randomNumeric(5)).withDocument(document).build();
+		UpdateQuery updateQuery = UpdateQuery.builder(nextIdAsString()).withDocument(document).build();
 		assertThatThrownBy(() -> operations.update(updateQuery, index))
 				.isInstanceOf(UncategorizedElasticsearchException.class);
 	}