Cannot find nodes in Graph using Kibana

I have created an index, updated the mappings, defined index patterns and ingested documents. However when i go the graph section in Kibana and try to search for some of the nodes, i get two behaviours - first one is no response and second for certain fields '
Error 400 Bad Request: Fielddata is disabled on text fields by default. Set fielddata=true on [action] in order to load fielddata in memory by uninverting the inverted index. Note that this can however use significant memory. Alternatively use a keyword field instead.'

I have tried updating the mapping with fielddata=true as per the elastic documentation but still doesn't work. Any assistance would be highly appreciated. Also please let me know if any additional information is required.

Check out the"why are results missing?" suggestions.
These settings can be changed in the "settings" part of the Graph UI

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