MaxFieldLength in Solr - When indexing very large documents

I recently discovered that I was not able to find all text in a rather large document.
It turned out that solr truncates documents that are larger than 10000 words (default setting).
I increased the number to 1000000 words and re-indexed and saw that my document was now fully searchable.

The setting is found in solrconfig.xml

<maxFieldLength>1000000</maxFieldLength>