It's missing a leading {, so it's not valid JSON (just a typo).
FYI, the workaround should work for a lot of things, but it is actually missing data ("source_node"), which is the reason that we had to rename the index. Having the appropriate versions on both ends is highly recommended instead.
Like @pickypg said the best way is to update the versions on both ends. What I have is just a workaround, in case you want to bring back your dashboards fast. Otherwise you will see weird node names like below:
Apache, Apache Lucene, Apache Hadoop, Hadoop, HDFS and the yellow elephant
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