I think maybe you have to redo the indexes.
If you are monitoring files and indexing it, the index grows up every day, but it keeps indexing the old data adding the new data, I mean, if you have an index of 42 mb and every day you are indexing data, it will index these 42mb plus the data from day by day.
I had the same problem, and now with a license, I'm keeping doing the same thing as I was waiting my license.
I cleaned all the indexes and created a new ones. For example, for alerts, I deleted the one that I had, and I created a new one for each year (2015, 2014...) the past year, I've indexed them as static, which is the option "index once" while you are adding data, and for this year, I have one that is being indexing every day.
With this, I keep the old data, but It just consume mb one day (the day I indexed it) and the current year is growing but the space it consumes is lower than the others.
Be careful anyway to not index all the data in one day, pay atention to the limit, but It worked for me 🙂
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