about IndexNotFoundException[no such index

(from github.com/aisunny394)
I useing Fess-13.3.1 and Elasticsearch-7.3.1 for a month.

One day, OutofMemory error was in the log.
Therefore,I changed the settings below and restarted the service.

・ 「fess.in.bat」→「FESS_MAX_MEM 」
・ 「fess_config.properties」→「-Xmx」、「-Xms」
※Both were set to 4GB
~~~Server Spec~~~
Physical memory:16GB
OS:Win 10 Pro

After changing the memory settings, the first restart was completed successfully and was ready for use.
After that, I tweaked the memory settings again and restarted.
On the Windows service management screen, you can see it running.
But, Could not access http: // localhost: 8080.
“404 Not Found”
I switched back the changes, but the problem didn’t go away.

Please help me with causes, countermeasures, etc.
Thank you for reading.

~~~~~What I tried~~~~~
・ Stop using the external Elasticserch,
Switched to ES inside Fess.
・ Check the status with the following two commands. ※See attached file for details.
curl -XGET localhost:9200/_cat/health?v
curl localhost:9200/_cat/indices?v
・ Fess only, rebuild(Fess folder deletion & resetting)

~~~~Log overview~~~~
fess.log ※See attached file for details.
2019-10-11 09:54:00,684 [main] ERROR Failed to initialize Lasta Di.
org.lastaflute.di.exception.ContainerInitFailureException: Look! Read the message below.
/* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
Failed to initialize the container.

[ESSR0060]Can not configure method(open) of org.codelibs.fess.es.client.FessEsClient, because [fess] IndexNotFoundException[no such index [fess]]


(from github.com/marevol)
Where is OOM occured? It seems not to be in Fess…

(from github.com/aisunny394)
Thank you for Reply.
This is the log when Fess was last running.
You can check the output of OOM.
There was a problem after reboot after this log.
Prior to this, multiple OOMs were displayed from the “Fault URL” on the management screen.

Thank you.

(from github.com/marevol)
I see.

・ 「fess.in.bat」→「FESS_MAX_MEM 」

You do not need to change it.

org.elasticsearch.ElasticsearchStatusException: Elasticsearch exception [type=illegal_argument_exception, reason=no write index is defined for alias [fess.update]. The write index may be explicitly disabled using is_write_index=false or the alias points to multiple indices without one being designated as a write index]

fess index seems to be broken.

(from github.com/aisunny394)
What is the cause of index corruption?
This log was the first to see the error.
OOM itself was out before this.
Is there a way to fix the fess index?
I want to use it safely.

Thank you for your support.

(from github.com/marevol)
Reindex might fix it.

(from github.com/aisunny394)
Thank you for your support.
I will study more.