diff --git a/src/main/java/org/springframework/data/elasticsearch/client/util/RequestConverters.java b/src/main/java/org/springframework/data/elasticsearch/client/util/RequestConverters.java
index 3c74acb41..0163e01c6 100644
--- a/src/main/java/org/springframework/data/elasticsearch/client/util/RequestConverters.java
+++ b/src/main/java/org/springframework/data/elasticsearch/client/util/RequestConverters.java
@@ -81,6 +81,7 @@ import org.elasticsearch.index.reindex.AbstractBulkByScrollRequest;
 import org.elasticsearch.index.reindex.DeleteByQueryRequest;
 import org.elasticsearch.index.reindex.ReindexRequest;
 import org.elasticsearch.index.reindex.UpdateByQueryRequest;
+import org.elasticsearch.index.seqno.SequenceNumbers;
 import org.elasticsearch.search.fetch.subphase.FetchSourceContext;
 import org.elasticsearch.tasks.TaskId;
 import org.springframework.data.elasticsearch.client.reactive.ReactiveElasticsearchClient;
@@ -116,6 +117,8 @@ public class RequestConverters {
 		parameters.withTimeout(deleteRequest.timeout());
 		parameters.withVersion(deleteRequest.version());
 		parameters.withVersionType(deleteRequest.versionType());
+		parameters.withIfSeqNo(deleteRequest.ifSeqNo());
+		parameters.withIfPrimaryTerm(deleteRequest.ifPrimaryTerm());
 		parameters.withRefreshPolicy(deleteRequest.getRefreshPolicy());
 		parameters.withWaitForActiveShards(deleteRequest.waitForActiveShards());
 		return request;
@@ -315,6 +318,8 @@ public class RequestConverters {
 		parameters.withTimeout(indexRequest.timeout());
 		parameters.withVersion(indexRequest.version());
 		parameters.withVersionType(indexRequest.versionType());
+		parameters.withIfSeqNo(indexRequest.ifSeqNo());
+		parameters.withIfPrimaryTerm(indexRequest.ifPrimaryTerm());
 		parameters.withPipeline(indexRequest.getPipeline());
 		parameters.withRefreshPolicy(indexRequest.getRefreshPolicy());
 		parameters.withWaitForActiveShards(indexRequest.waitForActiveShards());
@@ -917,6 +922,20 @@ public class RequestConverters {
 			return this;
 		}
 
+		Params withIfSeqNo(long seqNo) {
+			if (seqNo != SequenceNumbers.UNASSIGNED_SEQ_NO) {
+				return putParam("if_seq_no", Long.toString(seqNo));
+			}
+			return this;
+		}
+
+		Params withIfPrimaryTerm(long primaryTerm) {
+			if (primaryTerm != SequenceNumbers.UNASSIGNED_PRIMARY_TERM) {
+				return putParam("if_primary_term", Long.toString(primaryTerm));
+			}
+			return this;
+		}
+
 		Params withWaitForActiveShards(ActiveShardCount activeShardCount) {
 			return withWaitForActiveShards(activeShardCount, ActiveShardCount.DEFAULT);
 		}
diff --git a/src/test/java/org/springframework/data/elasticsearch/client/util/RequestConvertersTest.java b/src/test/java/org/springframework/data/elasticsearch/client/util/RequestConvertersTest.java
new file mode 100644
index 000000000..de56af80b
--- /dev/null
+++ b/src/test/java/org/springframework/data/elasticsearch/client/util/RequestConvertersTest.java
@@ -0,0 +1,93 @@
+/*
+ * Copyright 2018-2019 the original author or authors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.springframework.data.elasticsearch.client.util;
+
+import static org.hamcrest.Matchers.hasEntry;
+import static org.hamcrest.Matchers.hasKey;
+import static org.hamcrest.Matchers.not;
+import static org.junit.Assert.assertThat;
+
+import java.util.HashMap;
+
+import org.elasticsearch.action.delete.DeleteRequest;
+import org.elasticsearch.action.index.IndexRequest;
+import org.elasticsearch.client.Request;
+import org.junit.Test;
+
+/**
+ * Unit tests for {@link RequestConverters}.
+ *
+ * @author Roman Puchkovskiy
+ */
+public class RequestConvertersTest {
+	@Test // DATAES-652
+	public void shouldNotAddIfSeqNoAndIfPrimaryTermToResultIfInputDoesNotcontainThemWhenConvertingIndexRequest() {
+		IndexRequest request = createMinimalIndexRequest();
+
+		Request result = RequestConverters.index(request);
+
+		assertThat(result.getParameters(), not(hasKey("if_seq_no")));
+		assertThat(result.getParameters(), not(hasKey("if_primary_term")));
+	}
+
+	private IndexRequest createMinimalIndexRequest() {
+		IndexRequest request = new IndexRequest("the-index", "the-type", "id");
+		request.source(new HashMap<String, String>() {
+			{
+				put("test", "test");
+			}
+		});
+		return request;
+	}
+
+	@Test // DATAES-652
+	public void shouldAddIfSeqNoAndIfPrimaryTermToResultIfInputcontainsThemWhenConvertingIndexRequest() {
+		IndexRequest request = createMinimalIndexRequest();
+		request.setIfSeqNo(3);
+		request.setIfPrimaryTerm(4);
+
+		Request result = RequestConverters.index(request);
+
+		assertThat(result.getParameters(), hasEntry("if_seq_no", "3"));
+		assertThat(result.getParameters(), hasEntry("if_primary_term", "4"));
+	}
+
+	@Test // DATAES-652
+	public void shouldNotAddIfSeqNoAndIfPrimaryTermToResultIfInputDoesNotcontainThemWhenConvertingDeleteRequest() {
+		DeleteRequest request = createMinimalDeleteRequest();
+
+		Request result = RequestConverters.delete(request);
+
+		assertThat(result.getParameters(), not(hasKey("if_seq_no")));
+		assertThat(result.getParameters(), not(hasKey("if_primary_term")));
+	}
+
+	private DeleteRequest createMinimalDeleteRequest() {
+		return new DeleteRequest("the-index", "the-type", "id");
+	}
+
+	@Test // DATAES-652
+	public void shouldAddIfSeqNoAndIfPrimaryTermToResultIfInputcontainsThemWhenConvertingDeleteRequest() {
+		DeleteRequest request = createMinimalDeleteRequest();
+		request.setIfSeqNo(3);
+		request.setIfPrimaryTerm(4);
+
+		Request result = RequestConverters.delete(request);
+
+		assertThat(result.getParameters(), hasEntry("if_seq_no", "3"));
+		assertThat(result.getParameters(), hasEntry("if_primary_term", "4"));
+	}
+}