diff --git a/server/src/main/java/org/elasticsearch/common/joda/Joda.java b/server/src/main/java/org/elasticsearch/common/joda/Joda.java
index f797d6e5dda14..3604c4ae1ebb4 100644
--- a/server/src/main/java/org/elasticsearch/common/joda/Joda.java
+++ b/server/src/main/java/org/elasticsearch/common/joda/Joda.java
@@ -148,7 +148,12 @@ public static JodaDateFormatter forPattern(String input) {
             formatter = ISODateTimeFormat.weekDateTime();
         } else if ("weekDateTimeNoMillis".equals(input) || "week_date_time_no_millis".equals(input)) {
             formatter = ISODateTimeFormat.weekDateTimeNoMillis();
-        } else if ("weekyear".equals(input) || "week_year".equals(input)) {
+        } else if ("week_year".equals(input)) {
+            deprecationLogger.getOrCompute()
+                .deprecate("week_year_format_name", "Format name \"week_year\" is deprecated and will be removed in a future version. " +
+                    "Use \"weekyear\" format instead");
+            formatter = ISODateTimeFormat.weekyear();
+        } else if ("weekyear".equals(input) ) {
             formatter = ISODateTimeFormat.weekyear();
         } else if ("weekyearWeek".equals(input) || "weekyear_week".equals(input)) {
             formatter = ISODateTimeFormat.weekyearWeek();
diff --git a/server/src/main/java/org/elasticsearch/common/time/DateFormatters.java b/server/src/main/java/org/elasticsearch/common/time/DateFormatters.java
index 216955a493d92..3a1d35a6af706 100644
--- a/server/src/main/java/org/elasticsearch/common/time/DateFormatters.java
+++ b/server/src/main/java/org/elasticsearch/common/time/DateFormatters.java
@@ -1174,6 +1174,9 @@ public class DateFormatters {
         new DateTimeFormatterBuilder().appendValue(WEEK_FIELDS_ROOT.weekBasedYear()).toFormatter(Locale.ROOT)
                                       .withResolverStyle(ResolverStyle.STRICT));
 
+    private static final DateFormatter WEEKYEAR = new JavaDateFormatter("weekyear",
+        new DateTimeFormatterBuilder().appendValue(WEEK_FIELDS_ROOT.weekBasedYear()).toFormatter(Locale.ROOT)
+            .withResolverStyle(ResolverStyle.STRICT));
     /*
      * Returns a formatter for a four digit year. (uuuu)
      */
@@ -1721,7 +1724,12 @@ public class DateFormatters {
         } else if (FormatNames.WEEK_DATE_TIME_NO_MILLIS.matches(input)) {
             return WEEK_DATE_TIME_NO_MILLIS;
         } else if (FormatNames.WEEK_YEAR.matches(input)) {
+            deprecationLogger.getOrCompute()
+                .deprecate("week_year_format_name", "Format name \"week_year\" is deprecated and will be removed in a future version. " +
+                    "Use \"weekyear\" format instead");
             return WEEK_YEAR;
+        } else if (FormatNames.WEEKYEAR.matches(input)) {
+            return WEEKYEAR;
         } else if (FormatNames.WEEK_YEAR_WEEK.matches(input)) {
             return WEEKYEAR_WEEK;
         } else if (FormatNames.WEEKYEAR_WEEK_DAY.matches(input)) {
diff --git a/server/src/main/java/org/elasticsearch/common/time/FormatNames.java b/server/src/main/java/org/elasticsearch/common/time/FormatNames.java
index 09be339c56d69..a710d5f95269c 100644
--- a/server/src/main/java/org/elasticsearch/common/time/FormatNames.java
+++ b/server/src/main/java/org/elasticsearch/common/time/FormatNames.java
@@ -59,6 +59,7 @@ public enum FormatNames {
     WEEK_DATE_TIME("week_date_time"),
     WEEK_DATE_TIME_NO_MILLIS("week_date_time_no_millis"),
     WEEK_YEAR("week_year"),
+    WEEKYEAR("weekyear"),
     WEEK_YEAR_WEEK("weekyear_week"),
     WEEKYEAR_WEEK_DAY("weekyear_week_day"),
     YEAR("year"),
diff --git a/server/src/test/java/org/elasticsearch/common/joda/JavaJodaTimeDuellingTests.java b/server/src/test/java/org/elasticsearch/common/joda/JavaJodaTimeDuellingTests.java
index 4721f7797634d..03398645261b0 100644
--- a/server/src/test/java/org/elasticsearch/common/joda/JavaJodaTimeDuellingTests.java
+++ b/server/src/test/java/org/elasticsearch/common/joda/JavaJodaTimeDuellingTests.java
@@ -502,9 +502,9 @@ public void testDuellingFormatsValidParsing() {
         assertSameDate("2012-1-31", "year_month_day");
         assertSameDate("2012-12-1", "year_month_day");
 
-        assertSameDate("2018", "week_year");
-        assertSameDate("1", "week_year");
-        assertSameDate("2017", "week_year");
+        assertSameDate("2018", "weekyear");
+        assertSameDate("1", "weekyear");
+        assertSameDate("2017", "weekyear");
 
         assertSameDate("2018-W29", "weekyear_week");
         assertSameDate("2018-W1", "weekyear_week");
diff --git a/test/framework/src/main/java/org/elasticsearch/test/ESTestCase.java b/test/framework/src/main/java/org/elasticsearch/test/ESTestCase.java
index 9d81bc7f5725d..efeec57cd20d6 100644
--- a/test/framework/src/main/java/org/elasticsearch/test/ESTestCase.java
+++ b/test/framework/src/main/java/org/elasticsearch/test/ESTestCase.java
@@ -128,6 +128,7 @@
 import java.util.Arrays;
 import java.util.Collection;
 import java.util.Collections;
+import java.util.EnumSet;
 import java.util.HashSet;
 import java.util.LinkedHashMap;
 import java.util.List;
@@ -870,7 +871,9 @@ private static String randomJodaAndJavaSupportedTimezone(List<String> zoneIds) {
      * Generate a random valid date formatter pattern.
      */
     public static String randomDateFormatterPattern() {
-        return randomFrom(FormatNames.values()).getName();
+        //WEEKYEAR should be used instead of WEEK_YEAR
+        EnumSet<FormatNames> formatNames = EnumSet.complementOf(EnumSet.of(FormatNames.WEEK_YEAR));
+        return randomFrom(formatNames).getName();
     }
 
     /**