fix: improve disabling and restoration of ES indexing settings (#4187)

Author: adrians5j

packages/migrations/src/migrations/5.38.0/002/ddb-es/index.ts

@@ -35,7 +35,6 @@ interface LastEvaluatedKey {
 }
 
 interface IndexSettings {
-    number_of_replicas: number;
     refresh_interval: `${number}s`;
 }
 

packages/migrations/src/migrations/5.39.0/001/ddb-es/index.ts

@@ -39,7 +39,6 @@ interface LastEvaluatedKey {
 }
 
 interface IndexSettings {
-    number_of_replicas: number;
     refresh_interval: `${number}s`;
 }
 

packages/migrations/src/migrations/5.39.2/001/ddb-es/index.ts

@@ -43,7 +43,6 @@ interface LastEvaluatedKey {
 }
 
 interface IndexSettings {
-    number_of_replicas: number;
     refresh_interval: `${number}s`;
 }
 

packages/migrations/src/migrations/5.39.6/001/ddb-es/index.ts

@@ -46,7 +46,6 @@ interface LastEvaluatedKey {
 }
 
 interface IndexSettings {
-    number_of_replicas: number;
     refresh_interval: `${number}s`;
 }
 

packages/migrations/src/utils/elasticsearch/disableEsIndexing.ts

@@ -18,7 +18,6 @@ export const disableElasticsearchIndexing = async (
             elasticsearchClient: params.elasticsearchClient,
             index,
             settings: {
-                number_of_replicas: 0,
                 refresh_interval: -1
             }
         });

packages/migrations/src/utils/elasticsearch/fetchOriginalEsSettings.ts

@@ -9,7 +9,6 @@ interface FetchOriginalElasticsearchSettingsParams {
 }
 
 interface IndexSettings {
-    number_of_replicas: number;
     refresh_interval: `${number}s`;
 }
 
@@ -21,10 +20,9 @@ export const fetchOriginalElasticsearchSettings = async (
         const settings = await esGetIndexSettings({
             elasticsearchClient: params.elasticsearchClient,
             index,
-            fields: ["number_of_replicas", "refresh_interval"]
+            fields: ["refresh_interval"]
         });
         return {
-            number_of_replicas: settings.number_of_replicas || 1,
             refresh_interval: settings.refresh_interval || "1s"
         };
     } catch (ex) {

packages/migrations/src/utils/elasticsearch/restoreOriginalEsSettings.ts

@@ -3,8 +3,7 @@ import { Logger } from "@webiny/data-migration";
 import { Client } from "@elastic/elasticsearch";
 
 interface IndexSettings {
-    number_of_replicas: number;
-    refresh_interval: `${number}s`;
+    refresh_interval: `${number}s` | "-1";
 }
 
 interface RestoreOriginalElasticsearchSettingsParams {
@@ -30,13 +29,22 @@ export const restoreOriginalElasticsearchSettings = async (
         if (!settings || typeof settings !== "object") {
             continue;
         }
+
+        // We must ensure that the refresh interval is not set to a negative value. Why?
+        // We've had a case where a migration run has been manually stopped, and the index settings
+        // were never restored. Once a second run was started and this restore function
+        // was called, the refresh interval was set to `-1s`, which effectively disabled indexing.
+        let refreshInterval = settings.refresh_interval || `1s`;
+        if (refreshInterval === "-1") {
+            refreshInterval = "1s";
+        }
+
         try {
             await esPutIndexSettings({
                 elasticsearchClient: params.elasticsearchClient,
                 index,
                 settings: {
-                    number_of_replicas: settings.number_of_replicas || 1,
-                    refresh_interval: settings.refresh_interval || `1s`
+                    refresh_interval: refreshInterval
                 }
             });
         } catch (ex) {