eSearch for Windows isn[SQ]t a widely known or standard application. There[SQ]s no single, established program with that exact name. It[SQ]s possible :

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It[SQ]s a very niche or specialized program:

Perhaps it[SQ]s a custom application developed for a specific company or organization, or a very small, obscure software.
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It[SQ]s a misspelling or a slightly different name:

The actual name might be similar but slightly off. Could you be thinking of a different name, or perhaps recall any other details about the program?
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It[SQ]s malware disguised as a search tool:

Be cautious if you encountered this name in an untrusted context. Many malicious programs disguise themselves as helpful utilities.

To help me understand what you[SQ]re looking for, please provide more information, such as:

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Where did you encounter this name?

(A website, a downloaded file, an advertisement, etc.)
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What is the program supposed to do?

(Search for files, search the web, something else?)
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Do you remember any other details about it?

(Its icon, the company that made it, etc.)

With more context, I might be able to help you identify the program.