diff --git a/src/main/kotlin/org/opensearch/indexmanagement/indexstatemanagement/action/ShrinkActionParser.kt b/src/main/kotlin/org/opensearch/indexmanagement/indexstatemanagement/action/ShrinkActionParser.kt
index d38c17496..d74e65bb6 100644
--- a/src/main/kotlin/org/opensearch/indexmanagement/indexstatemanagement/action/ShrinkActionParser.kt
+++ b/src/main/kotlin/org/opensearch/indexmanagement/indexstatemanagement/action/ShrinkActionParser.kt
@@ -54,14 +54,12 @@ class ShrinkActionParser : ActionParser() {
                 TARGET_INDEX_TEMPLATE_FIELD -> targetIndexTemplate = Script.parse(xcp, Script.DEFAULT_TEMPLATE_LANG)
                 ALIASES_FIELD -> {
                     if (xcp.currentToken() != XContentParser.Token.VALUE_NULL) {
+                        ensureExpectedToken(XContentParser.Token.START_ARRAY, xcp.currentToken(), xcp)
                         aliases = mutableListOf()
-                        when (xcp.currentToken()) {
-                            XContentParser.Token.START_OBJECT -> {
-                                while (xcp.nextToken() != XContentParser.Token.END_OBJECT) {
-                                    aliases.add(Alias.fromXContent(xcp))
-                                }
-                            }
-                            else -> ensureExpectedToken(XContentParser.Token.START_ARRAY, xcp.currentToken(), xcp)
+                        while (xcp.nextToken() != XContentParser.Token.END_ARRAY) {
+                            ensureExpectedToken(XContentParser.Token.FIELD_NAME, xcp.nextToken(), xcp)
+                            aliases.add(Alias.fromXContent(xcp))
+                            ensureExpectedToken(XContentParser.Token.END_OBJECT, xcp.nextToken(), xcp)
                         }
                     }
                 }
diff --git a/src/main/kotlin/org/opensearch/indexmanagement/opensearchapi/OpenSearchExtensions.kt b/src/main/kotlin/org/opensearch/indexmanagement/opensearchapi/OpenSearchExtensions.kt
index 8d6c23a6e..4288c88cf 100644
--- a/src/main/kotlin/org/opensearch/indexmanagement/opensearchapi/OpenSearchExtensions.kt
+++ b/src/main/kotlin/org/opensearch/indexmanagement/opensearchapi/OpenSearchExtensions.kt
@@ -83,9 +83,13 @@ fun XContentParser.instant(): Instant? {
 }
 
 fun XContentBuilder.aliasesField(aliases: List<Alias>): XContentBuilder {
-    val builder = this.startObject(ShrinkAction.ALIASES_FIELD)
-    aliases.forEach { it.toXContent(builder, ToXContent.EMPTY_PARAMS) }
-    return builder.endObject()
+    val builder = this.startArray(ShrinkAction.ALIASES_FIELD)
+    aliases.forEach {
+        builder.startObject()
+        it.toXContent(builder, ToXContent.EMPTY_PARAMS)
+        builder.endObject()
+    }
+    return builder.endArray()
 }
 
 fun XContentBuilder.optionalTimeField(name: String, instant: Instant?): XContentBuilder {
diff --git a/src/test/kotlin/org/opensearch/indexmanagement/indexstatemanagement/action/ShrinkActionIT.kt b/src/test/kotlin/org/opensearch/indexmanagement/indexstatemanagement/action/ShrinkActionIT.kt
index 1f563ed50..686a09265 100644
--- a/src/test/kotlin/org/opensearch/indexmanagement/indexstatemanagement/action/ShrinkActionIT.kt
+++ b/src/test/kotlin/org/opensearch/indexmanagement/indexstatemanagement/action/ShrinkActionIT.kt
@@ -6,9 +6,11 @@
 package org.opensearch.indexmanagement.indexstatemanagement.action
 
 import org.apache.logging.log4j.LogManager
+import org.opensearch.action.admin.indices.alias.Alias
 import org.opensearch.cluster.metadata.IndexMetadata
 import org.opensearch.common.settings.Settings
 import org.opensearch.common.unit.ByteSizeValue
+import org.opensearch.index.query.QueryBuilders
 import org.opensearch.indexmanagement.indexstatemanagement.IndexStateManagementRestTestCase
 import org.opensearch.indexmanagement.indexstatemanagement.model.Policy
 import org.opensearch.indexmanagement.indexstatemanagement.model.State
@@ -37,7 +39,7 @@ class ShrinkActionIT : IndexStateManagementRestTestCase() {
             maxShardSize = null,
             percentageOfSourceShards = null,
             targetIndexTemplate = Script(ScriptType.INLINE, Script.DEFAULT_TEMPLATE_LANG, "{{ctx.index}}$testIndexSuffix", mapOf()),
-            aliases = null,
+            aliases = listOf(Alias("test-alias1"), Alias("test-alias2").filter(QueryBuilders.termQuery("foo", "bar")).writeIndex(true)),
             forceUnsafe = true,
             index = 0
         )
@@ -116,6 +118,8 @@ class ShrinkActionIT : IndexStateManagementRestTestCase() {
                 getExplainManagedIndexMetaData(indexName).info?.get("message")
             )
             assertEquals("Write block setting was not reset after successful shrink", "true", getIndexBlocksWriteSetting(indexName))
+            val aliases = getAlias(targetIndexName, "")
+            assertTrue("Aliases were not added to shrunken index", aliases.containsKey("test-alias1") && aliases.containsKey("test-alias2"))
         }
     }
 
@@ -130,7 +134,7 @@ class ShrinkActionIT : IndexStateManagementRestTestCase() {
             maxShardSize = testMaxShardSize,
             percentageOfSourceShards = null,
             targetIndexTemplate = Script(ScriptType.INLINE, Script.DEFAULT_TEMPLATE_LANG, "{{ctx.index}}$testIndexSuffix", mapOf()),
-            aliases = null,
+            aliases = listOf(Alias("max-shard-alias")),
             forceUnsafe = true,
             index = 0
         )
@@ -206,6 +210,8 @@ class ShrinkActionIT : IndexStateManagementRestTestCase() {
             val indexSettings = getIndexSettings(indexName) as Map<String, Map<String, Map<String, Any?>>>
             val writeBlock = indexSettings[indexName]!!["settings"]!![IndexMetadata.SETTING_BLOCKS_WRITE] as String?
             assertNull("Write block setting was not reset after successful shrink", writeBlock)
+            val aliases = getAlias(targetIndexName, "")
+            assertTrue("Alias was not added to shrunken index", aliases.containsKey("max-shard-alias"))
         }
     }