I frequently get asked how many documents Alfresco Search Services can index and why is it 50 million. To shed some light on the subject I will begin with 50 million documents per instance.
The origin of 50 million documents came about while Alfresco was performing the 1 Billion Document Benchmark. This exercise used a range of files with different size documents. During the benchmark the limit was evaluated at 50 million as the optimal size, based on the data and AWS instances we were running at the time.