Failed to execute bulk item (index) BulkS hardRequest - due to Invalid UTF-8 middle byte exception

Elastic Stack Elasticsearch
1

My ES logs are filled with many such exceptions

Caused by: com.fasterxml.jackson.core.JsonParseException: Invalid UTF-8 middle byte 0x3c
 at [Source: org.elasticsearch.common.bytes.BytesReference$MarkSupportingStreamInputWrapper@7204b4bf; line: 1, column: 38]
        at com.fasterxml.jackson.core.JsonParser._constructError(JsonParser.java:1702) ~[jackson-core-2.8.10.jar:2.8.10]
        at com.fasterxml.jackson.core.base.ParserMinimalBase._reportError(ParserMinimalBase.java:558) ~[jackson-core-2.8.10.jar:2.8.10]
        at com.fasterxml.jackson.core.json.UTF8StreamJsonParser._reportInvalidOther(UTF8StreamJsonParser.java:3550) ~[jackson-core-2.8.10.j   ar:2.8.10]
        at com.fasterxml.jackson.core.json.UTF8StreamJsonParser._reportInvalidOther(UTF8StreamJsonParser.java:3557) ~[jackson-core-2.8.10.j   ar:2.8.10]
        at com.fasterxml.jackson.core.json.UTF8StreamJsonParser._decodeUtf8_2(UTF8StreamJsonParser.java:3327) ~[jackson-core-2.8.10.jar:2.8   .10]
        at com.fasterxml.jackson.core.json.UTF8StreamJsonParser._finishString2(UTF8StreamJsonParser.java:2517) ~[jackson-core-2.8.10.jar:2.   8.10]
        at com.fasterxml.jackson.core.json.UTF8StreamJsonParser._finishAndReturnString(UTF8StreamJsonParser.java:2469) ~[jackson-core-2.8.1   0.jar:2.8.10]
        at com.fasterxml.jackson.core.json.UTF8StreamJsonParser.getText(UTF8StreamJsonParser.java:315) ~[jackson-core-2.8.10.jar:2.8.10]
        at org.elasticsearch.common.xcontent.json.JsonXContentParser.text(JsonXContentParser.java:84) ~[elasticsearch-x-content-6.3.2.jar:6   .3.2]
        at org.elasticsearch.common.xcontent.support.AbstractXContentParser.textOrNull(AbstractXContentParser.java:269) ~[elasticsearch-x-c   ontent-6.3.2.jar:6.3.2]
        at org.elasticsearch.index.mapper.TextFieldMapper.parseCreateField(TextFieldMapper.java:564) ~[elasticsearch-6.3.2.jar:6.3.2]
        at org.elasticsearch.index.mapper.FieldMapper.parse(FieldMapper.java:297) ~[elasticsearch-6.3.2.jar:6.3.2]
        ... 44 more
2

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