shibd opened a new pull request, #20741:
URL: https://github.com/apache/pulsar/pull/20741
### Motivation
If a producer use `Schema.JSON(String.class)` schema, es sink connector will
throw `ClassCastException`.
1. Create a producer.
```java
Producer<String> producer = client.newProducer(Schema.JSON(String.class))
.topic("test-es")
.create();
MessageId msgID = producer.send({\"a\":1});
```
2. When es sink connector handle this message, it will throw
`ClassCastException`.
```
java.lang.ClassCastException: class java.lang.String cannot be cast to class
com.fasterxml.jackson.databind.JsonNode (java.lang.String is in module
java.base of loader 'bootstrap'; com.fasterxml.jackson.databind.JsonNode is in
unnamed module of loader 'app')
```
Exception throws on here:
https://github.com/apache/pulsar/blob/593fcb87b6d3bd6401eb4ffa4c25d8b3f724e49d/pulsar-io/elastic-search/src/main/java/org/apache/pulsar/io/elasticsearch/ElasticSearchSink.java#L382
The root cause is when the schema is not `RECORD` type, it will not transfer
to `JsonNode`.
https://github.com/apache/pulsar/blob/af1360fb167c1f9484fda5771df3ea9b21d1440b/pulsar-client/src/main/java/org/apache/pulsar/client/impl/schema/AutoConsumeSchema.java#L204-L220
### Modifications
- When `navtiveObject` is String, try to transfer it to JsonNode.
### Verifying this change
- Add `sendJsonStringSchemaTest ` to cover it.
### Documentation
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### Matching PR in forked repository
PR in forked repository:
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