Avro 1.9+ dropping defaults

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The helper builder drops the default value if the default value type does not match, eg if 0 is a default value of field type float then the following code will silently drop the default

public FieldBuilder19(Schema.Field other) {
if (other != null) {
_name = other.name();
_schema = other.schema();
_doc = other.doc();
_defaultVal = other.defaultVal(); // Its null for Avro 1.9+
_order = other.order(); // other.order() cannot be null under Avro 1.9.*
_props = other.getObjectProps();
}
}

Start at the FieldBuilder19(Schema.Field other) constructor shown in the issue and inspect how Avro 1.9+ exposes default values for fields whose value type differs from the schema type. Reproduce the float-field case with a default of 0, then verify that the default is preserved rather than silently becoming null.

Written by the indexing model from the issue text.