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  1. Debezium
  2. DBZ-1758

hstore.handling.mode docs seem inaccurate (and map shows null values)

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      There are 2 issues:

      1. Docs are inaccurate regarding default
        hstore.handling.mode
      1. `map` loses data in avro consumer

      The docs say that the default mode for `hstore.handling.mode` is `map`, however, I am finding that it is actually `json`:

      https://debezium.io/documentation/reference/1.0/connectors/postgresql.html#hstore-values
      HStore Values

      When hstore.handling.mode configuration property is set to map, then the connector will use the java.util.Map<String,String> logical type, MAP schema type for all HSTORE columns. This is the default mode.

      We need to either fix the docs to say `json` is the default, or actually make `map` the default.

      I also am finding that using kafka-avro-console-consumer, with `hstore` fields using `map` as the `hstore.handling.mode`, it just shows as null:
      pg:
      ```

      1. SELECT here_some_hstore FROM table;
        here_some_hstore
        --------------------
        "a"=>"1", "b"=>"2"
        ```

      kafka-avro-console-consumer
      ```
      "here_some_hstore":null
      ```

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            gmorling@redhat.com Gunnar Morling
            jfinzel Jeremy Finzel
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