Many of the "optimisation hints" that people dig up regarding SSD's actually originate from a few years ago when the technology was not fully understood by real-world users, and people were paranoid about the concept of "limited writes". (Popular misconceptions such as: "Oh my god, move the paging-file off the drive you idiot!", etc.) Unfortunately, pseudo-tech site after pseudo-tech site has copied that same list of flawed suggestions over the years without revision, leading to a great deal of misinformation being accepted as truth by new SSD owners desperate not to do something "wrong" with their new toy.
Not only has the technology matured, but it's also debunked many of the over-reactions that people made originally, such as the "disable indexing" suggestion. While read-speeds of SSD's are significantly faster than mechanical drives, the processing of large-amounts of data itself is still a bottleneck in most instances, such as "content search". The original idea behind disabling indexing was not to "save the drive" but it was wrongly assumed that it was simply no longer necessary, as "speed itself will solve everything". Indexing by its nature reduces any given set of matchable data into more practical subsets, and the system is designed to take advantage of this. For example, searching through a PDF of War and Peace for every occurrence of a particular word will always be improved by the use of an indexing layer, as the alternative is to physically search/compare every single word in a document, and no matter how fast the SSD, it won't help the CPU throughput by dumping that much "raw data" directly into the stream (never mind the poor struggling iFilter).
x2 search will of course function either way (with or without indexing) but it will always be faster and more efficient with it enabled. Essentially, there is no "down-side", as the indexing service (when used on an SSD) is harmless and (onboard controllers vs. storage cells being asynchronous) cannot interfere with user-activity in the traditional sense - which was one of the "performance fears" promulgated in the old days.
Most users these days have hybrid systems anyway, with a mixture of SSD's and internal mechanical drives (usually the ones the SSD's themselves replaced) and those will always benefit from indexing, as they're mostly used for dedicated storage anyway (which is exactly what indexing is best at).
The best advice for using an SSD is also the most obvious: treat it exactly as you would any other drive. Naturally, you must have it AHCI enabled and using Trim, etc, but aside from that (and if you're squeamish. a bit of "over-provisioning"), it should not
be handled with kid-gloves. The only bit of advice that should be followed from those "popular information" sites is to disable/uninstall all defragmenting services/programmes. They may still be used on mechanical drives, but never on an SSD.
Whatever you do, please do not listen to the naïve and self-important scare-mongers who will endlessly tout statements like "it will wear-out faster" if you use it excessively (which is something they read themselves online from an outdated source and took it as gospel). Technically, it is true, SSD's do have a limited number of "write-cycles" built into them (theoretically unlike mechanical drives), however as a normal user you will not saturate that limit in your lifetime (nor even in the proposed lifetime of the drive) unless you actually rewrite the entire
storage area of the drive continuously every day (all day long) for years on end. If you actually do that as part of your daily workload, you would be working with server-grade architectures in the first-place and so would have upgraded accordingly, so it's a non-issue (yes, there are server-grade SSD's as opposed to consumer-grade).
So, long story short: while SSD read-access is relatively instantaneous, it will still benefit from indexing even for silly things like plain old file-name searches - but obviously indexed structures contain far more than that kind of simple reference, and so the benefit becomes exponential if recognised for what it is.
Other common misguided suggestions also include moving the location of the indexing-file itself, not to mention the location of temp-directories, paging-files, etc, etc, etc - all of that is nonsense, as (with instant read-access) the SSD is precisely where such objects should reside in the first place by their very nature.
As stated above, the only truly important thing is AHCI and Trim (they are inter-related), and (especially if you cloned an old mechanical drive onto an SSD to save you re-installing windows) some extra steps may be required to sort that out properly, but if it's a new install or a new system, then you don't need to worry about that at all.
But to the point in hand: Indexing is as important (if not more-so due to the index-itself being zero-latent) for an SSD as it is in any mechanical medium. It's that simple.
And lastly, when reading any
articles on the web relating to SSD hardware, do not give them any credence if they are more than 2 years old. Just ignore them. There are many valuable, contemporary/certified sources of information available that will give you far more accurate information than any of those old sites/threads/"tech-comparison articles" leftover from bygone days. Of course, if you do choose to read up on these things, you should always research for yourself how the hardware actually works in the first place (it is somewhat technical), and you will be better armed with common-sense rather than falling prey to the pseudo-educated gurus out there who know nothing but their own fears and the lies they themselves were originally told.
Oh, and unrelated to your question, but topical for everyone else: Do not buy cheap SSD's off of Ebay thinking you got a great deal. Just don't. Cheap is bad. Refurbished is bad. "Slightly used" is bad. "Product may not be in its original packaging, but is guaranteed new" is bad. There are no deals. Do not listen to your cousin Larry. The girl in the office who is dating the guy in IT does not
know what she's talking about. It's all just bad bad bad. I always feel the need to mention that. I don't know why. I just do. Humans can be so dumb when it comes to the schlock and hokum of marketing and tech.