solr json payload model #30

This PR introduces the model classes used to store the json payload in the Solr documents

Dear @schatz @schatz.1f1484 @kiatrop @katerina.iatropoulou first of all apologies for the user spamming, but I don't know why there are multiple users associated to your accounts.

This PR is the 1st version of the model classes we are going to use to store the JSON records in solr. Please have a look and refine them.

Dear @schatz @schatz.1f1484 @kiatrop @katerina.iatropoulou first of all apologies for the user spamming, but I don't know why there are multiple users associated to your accounts. This PR is the 1st version of the model classes we are going to use to store the JSON records in solr. Please have a look and refine them.

Dear @schatz @katerina.iatropoulou
I am planning to perform the release based on the current state. This implies the records in beta will include the JSON payload as serialization of the model classes as they are defined today.

One side note, to avoid producing non necessary information (at least, according to my POV), I am implementing the serialization procedure so that it will not expand null values nor empty lists. Knowing that we will be sharing the same model classes this should not pose an issue, but I wanted to mention this aspect to be sure we are on the same page.

Dear @schatz @katerina.iatropoulou I am planning to perform the release based on the current state. This implies the records in beta will include the JSON payload as serialization of the model classes as they are defined today. One side note, to avoid producing non necessary information (at least, according to my POV), I am implementing the serialization procedure so that it will not expand null values nor empty lists. Knowing that we will be sharing the same model classes this should not pose an issue, but I wanted to mention this aspect to be sure we are on the same page.

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solr json payload model #30

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