Elasticsearch is not having indices from all the projects

Issue

• ElasticSearch does not have indices from all the projects but only from a few projects.
• Seen following error in ElasticSearch.

[2020-08-14T20:23:17,104][DEBUG][o.e.a.b.TransportShardBulkAction] [logging-es-data-master-vwtxnksr] [.operations.2020.08.14][0] failed to execute bulk item (create) BulkShardRequest [[.operations.2020.08.14][0]] containing [6433] requests
org.elasticsearch.index.mapper.MapperParsingException: failed to parse [message]
at org.elasticsearch.index.mapper.FieldMapper.parse(FieldMapper.java:298) ~[elasticsearch-5.6.16.redhat-2.jar:5.6.16.redhat-2]
        at org.elasticsearch.index.mapper.DocumentParser.parseObjectOrField(DocumentParser.java:468) ~[elasticsearch-5.6.16.redhat-2.jar:5.6.16.redhat-2]
        at org.elasticsearch.index.mapper.DocumentParser.parseValue(DocumentParser.java:591) ~[elasticsearch-5.6.16.redhat-2.jar:5.6.16.redhat-2]
        at org.elasticsearch.index.mapper.DocumentParser.innerParseObject(DocumentParser.java:396) ~[elasticsearch-5.6.16.redhat-2.jar:5.6.16.redhat-2]
        at org.elasticsearch.index.mapper.DocumentParser.parseObjectOrNested(DocumentParser.java:373) ~[elasticsearch-5.6.16.redhat-2.jar:5.6.16.redhat-2]
' ' ' 
' ' '
        at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624) [?:1.8.0_252]
        at java.lang.Thread.run(Thread.java:748) [?:1.8.0_252]
Caused by: com.fasterxml.jackson.core.JsonParseException: Invalid UTF-8 middle byte 0x3f
 at [Source: org.elasticsearch.common.bytes.BytesReference$MarkSupportingStreamInputWrapper@363f7fb4; line: 1, column: 811]
        at com.fasterxml.jackson.core.JsonParser._constructError(JsonParser.java:1702) ~[jackson-core-2.8.6.jar:2.8.6]
        at com.fasterxml.jackson.core.base.ParserMinimalBase._reportError(ParserMinimalBase.java:558) ~[jackson-core-2.8.6.jar:2.8.6]

• Fluentd reports the following error messages -

2020-07-02 13:16:37 -0400 [warn]: temporarily failed to flush the buffer. next_retry=2020-07-02 13:16:37 -0400 error_class="Elasticsearch::Transport::Transport::Errors::InternalServerError" error="[500] {\"error\":{\"root_cause\":[{\"type\":\"json_parse_exception\",\"reason\":\"Invalid UTF-8 start byte 0x92\\n at [Source: org.elasticsearch.transport.netty4.ByteBufStreamInput@144039f2; line: 1, column: 197]\"}],\"type\":\"json_parse_exception\",\"reason\":\"Invalid UTF-8 start byte 0x92\\n at [Source: org.elasticsearch.transport.netty4.ByteBufStreamInput@144039f2; line: 1, column: 197]\"},\"status\":500}" plugin_id="elasticsearch-apps"
  2020-07-02 13:16:37 -0400 [warn]: /usr/share/gems/gems/elasticsearch-transport-5.0.5/lib/elasticsearch/transport/transport/base.rb:202:in `__raise_transport_error'