Yeas, thought about that. To make sure I am doing the right thing, I deleted all indexes used on this search and just kept the newly created. Still got the same problem. Thanks.
For some mysterious reason, the issue just disappeared :-S
Although I'm glad not to see the error, I'm not comfortable not knowing what was done to solve it. I'm still using 6.3, didn't have the opportunity to upgrade to 6.5. Most probably I deleted all indexes and just ingested again in a fresh one, not an action that I would suggested as a good solution.
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