DCA-352:Jira full index time consistency (atlassian#258)

* DCA-352:Update the Jira database instance class; Update Jira reindex time * DCA-352:Reword notes text * DCA-352:Remove note frome first reindex; Add note to the Scenario 1 -> Run 2; * DCA-352:Reword reindex step according; Remove optional reindex; * DCA-352:Fix after review * Update dc-apps-performance-toolkit-user-guide-jira.md

Author: mmizin

docs/dc-apps-performance-toolkit-user-guide-jira.md

@@ -84,7 +84,7 @@ The Data Center App Performance Toolkit framework is also set up for concurrency
 
 | Parameter | Recommended Value |
 | --------- | ----------------- |
-| Database instance class | [db.m5.large](https://docs.aws.amazon.com/AmazonRDS/latest/UserGuide/Concepts.DBInstanceClass.html#Concepts.DBInstanceClass.Summary) |
+| Database instance class | [db.m5.xlarge](https://docs.aws.amazon.com/AmazonRDS/latest/UserGuide/Concepts.DBInstanceClass.html#Concepts.DBInstanceClass.Summary) |
 | RDS Provisioned IOPS | 1000 |
 | Master (admin) password | Password1! |
 | Enable RDS Multi-AZ deployment | true |
@@ -309,14 +309,16 @@ After [Importing the main dataset](#importingdataset), you'll now have to pre-lo
 Do not close or interrupt the session. It will take about two hours to upload attachments to Elastic File Storage (EFS).
 {{% /note %}}
 
-### <a id="reindexing"></a> Re-indexing Jira Data Center (~1 hour)
+### <a id="reindexing"></a> Re-indexing Jira Data Center (~30 min)
 
 For more information, go to [Re-indexing Jira](https://confluence.atlassian.com/adminjiraserver/search-indexing-938847710.html).
 
 1. Log in as a user with the **Jira System Administrators** [global permission](https://confluence.atlassian.com/adminjiraserver/managing-global-permissions-938847142.html).
 1. Go to **![cog icon](/platform/marketplace/images/cog.png) &gt; System &gt; Indexing**.
-1. Select the **Lock one Jira node and rebuild index** option.
+1. Select the **Full re-index** option.
 1. Click **Re-Index** and wait until re-indexing is completed.
+1. **Take a screenshot of the acknowledgment screen** displaying the re-index time and Lucene index timing.
+1. Attach the screenshot to your DCHELP ticket.
 
 Jira will be unavailable for some time during the re-indexing process. When finished, the **Acknowledge** button will be available on the re-indexing page.
 
@@ -405,28 +407,24 @@ Review `results_summary.log` file under artifacts dir location. Make sure that o
 
 #### <a id="regressionrun2"></a> Run 2 (~50 min + Lucene Index timing test)
 
-If you are submitting a Jira app, you are required to conduct a Lucene Index timing test. This involves conducting a foreground re-index on a single-node Data Center deployment (without and with your app installed) and a dataset that has 1M issues.
-
-First, benchmark your re-index time without your app installed:
+If you are submitting a Jira app, you are required to conduct a Lucene Index timing test. This involves conducting a foreground re-index on a single-node Data Center deployment (with your app installed) and a dataset that has 1M issues.
 
 {{% note %}}
-Jira 7 index time for 1M issues on a User Guide [recommended configuration](#quick-start-parameters) is about ~100 min, Jira 8 index time is about ~40 min.
+Jira 7 index time for 1M issues on a User Guide [recommended configuration](#quick-start-parameters) is about ~100 min, Jira 8 index time is about ~30 min.
 {{% /note %}}
 
-1. Go to **![cog icon](/platform/marketplace/images/cog.png) &gt; System &gt; Indexing**.
-1. Select the **Lock one Jira node and rebuild index** option.
-1. Click **Re-Index** and wait until re-indexing is completed.
-1. **Take a screenshot of the acknowledgment screen** displaying the re-index time and Lucene index timing.
-1. Attach the screenshot to your DC HELP ticket.
+{{% note %}}
+If your Amazon RDS DB instance class is lower then db.m5.xlarge it is required to wait ~2 hours after previous reindex finish before starting a new one.
+{{% /note %}}
 
-Next, benchmark your re-index time with your app installed:
+Benchmark your re-index time with your app installed:
 
 1. Install the app you want to test.
 1. Go to **![cog icon](/platform/marketplace/images/cog.png) &gt; System &gt; Indexing**.
-1. Select the **Lock one Jira node and rebuild index** option.
+1. Select the **Full re-index** option.
 1. Click **Re-Index** and wait until re-indexing is completed.
 1. **Take a screenshot of the acknowledgment screen** displaying the re-index time and Lucene index timing.
-1. Attach the screenshot to your DC HELP ticket.
+1. Attach the screenshot to your DCHELP ticket.
 
 After attaching both screenshots to your DC HELP ticket, move on to performance results generation with an app installed: