Stream ingestion Kafka to Pinot error invalid utf-8 start byte

Hi everyone,

Pinot version: 0.12.1
Java JDK: 11

I tried to ingestion data realtime from kafka to pinot with 2 cases:
**Case 1: It work like charm**
`{"event":{"header": "v1","body":{"gender":"M", "region":"London"}}}`

**Case 2: Error**
But when i use data contain some special character like this **"Â" (Vietnamese word)**

`[{"event":{"header": "v1","body":{"gender":"M", "region":"Âmerica"}}}](url)`

I faced an error

`org.apache.pinot.shaded.com.fasterxml.jackson.core.JsonParseException: Invalid UTF-8 start byte 0x96`

It's seem problem cause by com.fasterxml.jackson library. How to resolve it? Thank you so much

Detail exeption

```
org.apache.pinot.shaded.com.fasterxml.jackson.core.JsonParseException: Invalid UTF-8 start byte 0x96
at [Source: (ByteArrayInputStream); line: 1, column: 410]
at org.apache.pinot.shaded.com.fasterxml.jackson.core.JsonParser._constructError(JsonParser.java:2337) ~[pinot-all-0.12.1-jar-with-dependencies.jar:0.12.1-6e235a4ec2a16006337da04e118a435b5bb8f6d8]
at org.apache.pinot.shaded.com.fasterxml.jackson.core.base.ParserMinimalBase._reportError(ParserMinimalBase.java:710) ~[pinot-all-0.12.1-jar-with-dependencies.jar:0.12.1-6e235a4ec2a16006337da04e118a435b5bb8f6d8]
at org.apache.pinot.shaded.com.fasterxml.jackson.core.json.UTF8StreamJsonParser._reportInvalidInitial(UTF8StreamJsonParser.java:3607) ~[pinot-all-0.12.1-jar-with-dependencies.jar:0.12.1-6e235a4ec2a16006337da04e118a435b5bb8f6d8]
at org.apache.pinot.shaded.com.fasterxml.jackson.core.json.UTF8StreamJsonParser._reportInvalidChar(UTF8StreamJsonParser.java:3603) ~[pinot-all-0.12.1-jar-with-dependencies.jar:0.12.1-6e235a4ec2a16006337da04e118a435b5bb8f6d8]
at org.apache.pinot.shaded.com.fasterxml.jackson.core.json.UTF8StreamJsonParser._finishString2(UTF8StreamJsonParser.java:2545) ~[pinot-all-0.12.1-jar-with-dependencies.jar:0.12.1-6e235a4ec2a16006337da04e118a435b5bb8f6d8]
at org.apache.pinot.shaded.com.fasterxml.jackson.core.json.UTF8StreamJsonParser._finishAndReturnString(UTF8StreamJsonParser.java:2471) ~[pinot-all-0.12.1-jar-with-dependencies.jar:0.12.1-6e235a4ec2a16006337da04e118a435b5bb8f6d8]
at org.apache.pinot.shaded.com.fasterxml.jackson.core.json.UTF8StreamJsonParser.getText(UTF8StreamJsonParser.java:302) ~[pinot-all-0.12.1-jar-with-dependencies.jar:0.12.1-6e235a4ec2a16006337da04e118a435b5bb8f6d8]
at org.apache.pinot.shaded.com.fasterxml.jackson.databind.deser.std.BaseNodeDeserializer.deserializeObject(JsonNodeDeserializer.java:286) ~[pinot-all-0.12.1-jar-with-dependencies.jar:0.12.1-6e235a4ec2a16006337da04e118a435b5bb8f6d8]
at org.apache.pinot.shaded.com.fasterxml.jackson.databind.deser.std.JsonNodeDeserializer.deserialize(JsonNodeDeserializer.java:69) ~[pinot-all-0.12.1-jar-with-dependencies.jar:0.12.1-6e235a4ec2a16006337da04e118a435b5bb8f6d8]
at org.apache.pinot.shaded.com.fasterxml.jackson.databind.deser.std.JsonNodeDeserializer.deserialize(JsonNodeDeserializer.java:16) ~[pinot-all-0.12.1-jar-with-dependencies.jar:0.12.1-6e235a4ec2a16006337da04e118a435b5bb8f6d8]
at org.apache.pinot.shaded.com.fasterxml.jackson.databind.deser.DefaultDeserializationContext.readRootValue(DefaultDeserializationContext.java:322) ~[pinot-all-0.12.1-jar-with-dependencies.jar:0.12.1-6e235a4ec2a16006337da04e118a435b5bb8f6d8]
at org.apache.pinot.shaded.com.fasterxml.jackson.databind.ObjectReader._bindAsTree(ObjectReader.java:2070) ~[pinot-all-0.12.1-jar-with-dependencies.jar:0.12.1-6e235a4ec2a16006337da04e118a435b5bb8f6d8]
at org.apache.pinot.shaded.com.fasterxml.jackson.databind.ObjectReader._bindAndCloseAsTree(ObjectReader.java:2044) ~[pinot-all-0.12.1-jar-with-dependencies.jar:0.12.1-6e235a4ec2a16006337da04e118a435b5bb8f6d8]
at org.apache.pinot.shaded.com.fasterxml.jackson.databind.ObjectReader.readTree(ObjectReader.java:1739) ~[pinot-all-0.12.1-jar-with-dependencies.jar:0.12.1-6e235a4ec2a16006337da04e118a435b5bb8f6d8]
at org.apache.pinot.spi.utils.JsonUtils.bytesToJsonNode(JsonUtils.java:211) ~[pinot-all-0.12.1-jar-with-dependencies.jar:0.12.1-6e235a4ec2a16006337da04e118a435b5bb8f6d8]
at org.apache.pinot.plugin.inputformat.json.JSONMessageDecoder.decode(JSONMessageDecoder.java:61) [pinot-all-0.12.1-jar-with-dependencies.jar:0.12.1-6e235a4ec2a16006337da04e118a435b5bb8f6d8]
at org.apache.pinot.plugin.inputformat.json.JSONMessageDecoder.decode(JSONMessageDecoder.java:73) [pinot-all-0.12.1-jar-with-dependencies.jar:0.12.1-6e235a4ec2a16006337da04e118a435b5bb8f6d8]
at org.apache.pinot.plugin.inputformat.json.JSONMessageDecoder.decode(JSONMessageDecoder.java:37) [pinot-all-0.12.1-jar-with-dependencies.jar:0.12.1-6e235a4ec2a16006337da04e118a435b5bb8f6d8]
at org.apache.pinot.spi.stream.StreamDataDecoderImpl.decode(StreamDataDecoderImpl.java:47) [pinot-all-0.12.1-jar-with-dependencies.jar:0.12.1-6e235a4ec2a16006337da04e118a435b5bb8f6d8]
at org.apache.pinot.core.data.manager.realtime.LLRealtimeSegmentDataManager.processStreamEvents(LLRealtimeSegmentDataManager.java:549) [pinot-all-0.12.1-jar-with-dependencies.jar:0.12.1-6e235a4ec2a16006337da04e118a435b5bb8f6d8]
at org.apache.pinot.core.data.manager.realtime.LLRealtimeSegmentDataManager.consumeLoop(LLRealtimeSegmentDataManager.java:434) [pinot-all-0.12.1-jar-with-dependencies.jar:0.12.1-6e235a4ec2a16006337da04e118a435b5bb8f6d8]
at org.apache.pinot.core.data.manager.realtime.LLRealtimeSegmentDataManager$PartitionConsumer.run(LLRealtimeSegmentDataManager.java:629) [pinot-all-0.12.1-jar-with-dependencies.jar:0.12.1-6e235a4ec2a16006337da04e118a435b5bb8f6d8]
at java.lang.Thread.run(Thread.java:834) [?:?]
```

Start by reading JSONMessageDecoder.decode and JsonUtils.bytesToJsonNode, the two entry points named in the stack trace, then reproduce the failure with the supplied Kafka payload and Pinot 0.12.1 environment. Compare the byte encoding of the working and failing messages; done means the ingestion path has an agreed, verified outcome for the supplied special-character payload.

Written by the indexing model from the issue text.