Getting ready

The most straightforward technique to train a model is to use the OpenNLP command-line tools. Download these tools from the OpenNLP page at https://opennlp.apache.org/download.html. We will not need the source code for these tools, so download the file named apache-opennlp-1.9.0-bin.tar.gz. Selecting that file will take you to a page that lists mirror sites for the file. Choose one that will work best for your location.

Once the file has been saved, expand the file. This will extract a .tar file. Next, expand this file, which will create a directory called apache-opennlp-1.9.0. In its bin subdirectory, you will find the tools that we need.

We will need training data for the training process. We will use the en-lemmatizer.dict file found at https://raw.githubusercontent.com/richardwilly98/elasticsearch-opennlp-auto-tagging/master/src/main/resources/models/en-lemmatizer.dict. Use a browser to open this page and then save this page using the file name en-lemmatizer.dict.