mechanism to temporarily prevent text retrieval

[hi-ko]

the content tracker still needs to run synchronously. We need a mechanism to temporarily prevent text retrieval to avoid scalability issues and timeouts (caused by async transactions) - especially if we already know that they are long running like for ocr.

In the old, sync transformer framework it was possible to fake such a feature by setting cm:isContentIndexed=false to prevent the node to be catched up from the repository before it has been transformed and to remove that aspect later when the text transformation is available.

#395 / SEARCH-2974 breakes this old "feature". So either we get a new feature to postpone the text retrieval or the mechanism for isContentIndexed is working again as expected e.g.

• if a new node get's cm:isContentIndexed=false property added by behavior it must not result into an empty index doc
• when removing the aspect or setting isContentIndexed to true later the text should be indexed